The Qunari are pleased because the Inquisition has dealt with those various problems for them, eliminating any issues that would bog down their eventual invasion of the South without any collateral damage to Qunari forces. Why lose your forces taking down Venatori or having to rebuild a burned down Denerim, when you can hand the information to the Inquisition to carry out the Qunari's will, risking them nothing in the process?
Yes, and the point is that the Inquisition is not a threat to order or the rest of the world, and the Triumvirate knows this. That is why they keep entrusting the Inquisition with tasks that the Ben-Hassrath isn't up to completing. This is why Viddasala's claims about the Qunari leaving the South to curb the Inquisitor's magic are lies. The Triumvirate did no such thing. It supported the Inquisition's actions. If this had been an authorized operation, then the one leading the Qunari in that case would have told the Inquisitor, "You have done well restoring the South to order thus far, Bas-Salit'an. Now the Triumvirate would have you see this task through to its logical conclusion; bringing the South under the Qun."
Also, about Denerim. Why would the Qunari rebuild Denerim after letting it burn? They would just clear it out and build something better. The point of letting Denerim burn down would be to make Ferelden weaker against their invasion. Instead, the Qunari worked to protect Denerim, and the mission can be a success even with their direct help.
The fact that Viddasala had to make stuff up to justify the attack is proof that it wasn't authorized. The Triumvirate needs no justification for conquest.
Viddasala's meaning was that they thought the South would either destroy itself or curb it's own magic if left to their own devices, whatever the outcome of the Mage-Templar War happened to be. At this point, the conflict didn't threaten them and wasn't considered a problem, who cares if everyone in the South died?
She said nothing of the mage/templar war.
The emergence of the Breach however proved that magic in the south was simply too dangerous to be left unchecked, especially as it was the second magical explosion had occurred within the past half-decade. It proved to the Qunari that it was not in the good of Thedas for them to standby and watch from afar, lest their non-intervention fail to prevent magic from threatening the world again.
They don't care about magical explosions, so long as they aren't happening against Qunari. The Breach was their concern, and in DA:I they only sent spies to gain information about the Breach, not to plan any kind of invasion strategy.
Bull's mission was to infiltrate the Inquisition and report back to his superiors the means of their operations, he tells us this in his first conversation. He never said his purpose was to prevent the invasion from taking place, nor that he has the rank or seniority to make that decision. He merely hoped that his reports would ease some minds back home, not convince them to call anything off.
He said that he was sent to send information back so those in Par Vollen could decided if they needed to launch and invasion or not. That means the action of invading depended upon no one doing anything to solve the problem of the Breach. They wanted to know if the Breach was something that they would have to solve themselves.
The Exalted Council has a lot of major players from the South in attendance, the Divine, clerics from the Chantry, political ambassadors, the Inquisitions entire top brass...it's the perfect venue for the Qunari to cut off the head of every single power in one fell swoop. The game even tells us this directly when they discuss how terrifying it was that Dragon's Breath nearly succeeded, with even Leliana stating that wiping out all opposition at once was tactically a brilliant move.
Clerics are nobodies. Ambassadors are nobodies. Each possible Divine is likely to survive an attack, which means her successors are as well. Cullen and Josephine are the only ones at risk. They would have to hit every court across Southern Thedas, which isn't even possible. There are hundreds of noble houses across Ferelden and Orlais alone, not even counting The Free Marches or Nevarra.
Dragon's Breath had zero chance of success, even at the Winter Palace alone. Ignoring Solas' involvement, the Inquisition had its own loyal scouts, an army of guards, a Seeker, Friends of Red Jenny, a mind-reading spirit, a skilled player of the Grand Game, and possibly a former ben-hassrath. Any one of them could have spotted strange barrels being placed all over, or in Cole's case, read their mind and sensed their desire to hurt people. Also, what happens when Dorian goes looking for more wine?
Even Leliana stating it was tactically a brilliant move? Leliana is dumb. You know that right? And as I recall, she only said it was what Corypheus should have done after the conclave.
The alliance is temporary and not bound in any agreement save for that the Qunari find it a useful tool. Despite what you seem to think, they're not going to honour it any more than the Llomeryn Accords (a bit of paper to them) when they invade.
I'm sure they will discard the alliance one day, but my point was what you just admitted. The Qunari find it a useful tool. Therefore, Viddasala was lying and acting against Par Vollen's interests.
The Qunari left the South alone hoping that they'd find a more Qunari way of dealing with their mages, believing that the carelessness with which they treated them would eventually destroy them. The war was proof that the South could no longer be trusted to control their mages, the Breach being created by magic cemented this as fact to the Qunari, that they needed to step in now and do something about it.
And how does that make sense in a Divine Vivienne world state where the templars were sided with? The Circles are back and better than ever. Also, ancient
Tevinter magister rips sky a new one = Blame the South? How did the Qunari arrive at that conclusion?
As I wrote above, Viddasala said nothing about the war. It was only about the Breach, and on that she was lying. Iron Bull confirmed he was sent to gather and send back information on the Breach and what the South was doing about it. With the Breach and its apparent cause corrected, the Qunari would have no reason to invade other than the usual one of the Qun being spread throughout the world. Meaning, Viddasala's excuse that invasion was happening because of the Breach or the Inquisitor are lies. In fact, Viddasala probably suggested invasion when the Breach first appeared, claiming it would be easy to take the South when it is in such disarray. The Triumvirate likely rejected that idea and wanted to gather information first. Then when things looked to be going well (the Breach was sealed within months), the Triumvirate not only decided not to invade, it suggested forming an alliance. This is probably what sent Viddasala off the deep end. So she began plotting to go around the Triumvirate.
Bull states that they want to invade and Viddasala states part of the plan was to eventually remove all their leaders, how is that a contradiction? You assume that the invasion was meant to be immediate following the Breach, rather than something that they were gearing up for in preparation to strike.
Bull said they want to see if invasion is called for, not that they wanted to invade at that time. Just because they want to invade eventually doesn't mean they wanted to during Trespasser. Viddasala contradicts Bull when she says that the Qunari decided their action (kill leaders and invade) when they first saw the Breach. That is a lie. The action they decided on was to send spies to gather information to see if invasion was necessary to correct the problem.
The reason that Bull was sent to the Inquisition because they were the only group doing anything about the Breach, as well as having someone with a magical glowing hand that could seal rifts. Compared to the other groups in the south at the time DAI starts, the Inquisition were the best chance to close the Breach and the Inquisitor's ability was a necessary evil the Qunari could tolerate.
And entrust Qunari lives with, and ally with if the mission is successful, and entrust more missions to for the next two years.
Still, we can gather from Viddasala that not all Qunari were happy with the Inquisitor running around unchecked, as it was our task to close the Breach and we fulfilled that role, yet the mark was still a threat to the entire world because of the power it held.
The power to close rifts. That is an awful thing? Not awful enough that the Triumvirate keeps sending requests to the one wielding it.