We do not see Howe making any suggestion as to the selling of elves. The only scene we see Howe having a hand in actually is the hiring of Zevran. And even then he seeks permission from Loghain before sending Zevran out. Now we do find out Howe was stealing from the treasury (during the Slim Coudry quests), but speaking to Caladrius, it's Loghain behind the elven slavery thing. It's Loghain's name on the papers, Loghain who rants and raves to Caladrius about the Warden. If Loghain wasn't the brain behind that little idea, he certainly had blood on his hands because he was aware and complicit.
Just as I won't condemn Loghain for the Cousland massacre (something we see no evidence in game of being truth beyond his acceptance of Howe afterward) I won't condemn Howe for something we can only speculate happened. Both are great for head canon if you want to achieve some roleplaying aspect, but there isn't any hard evidence in game for it.
The only other place we do see Howe offering advice, he is advising Loghain to address the darkspawn sweeping over the nation and Loghain would rather continue fighting the bannorn than address the issue. He may be pragmatic, but he has serious blinders on when it comes to Orlais and his pride. Had he never usurped Anora, he could have been the military commander, let her deal with the bannorn. She's trained for it, it's something she's good at. But his pride wouldn't let him accept help from anyone, even his own daughter. I wonder how much of his pride is wrapped up in his patriotism, and casts a different light on his actions.
It makes for an interesting and complex villain. He has motives we can all understand and relate to, possibly even pity or sympathize with him, but his methods "ends justify the means" doesn't make him a "true or honest" person, although it does make him a very "Grey Warden" kind of person. If nothing else, this advertises the wisdom of making him a warden, since you know he will do whatever it takes to stop the Archdemon. I just can't bring myself to do it. I don't clasp an asp to my bosom, I get a big stick and smash it.
I believe that any major commercial business or trade made between two nations has to be authorized by the higher authority of each of them. Loghain was the regent of Ferelden at the time, so Caladrius needed his signature in all legal documents referring to the selling of elves. Which is why it's his name and not Howe's that's everywhere in those papers. Should Loghain have died in Ostagar, then the signature would have to be Anora's, just to illustrate.
I agree with your points. The way Loghain chose to act was the problem. Maybe he could've steered Ferelden safely through the crisis. If only he had better help than Howe in governing the country...Also, I agree with how he made a very convincing Warden in Inquisition. He does look more "Wardenly" than Alistair IMO. More serious, more dutiful, readier to make sacrifices for the greater good. But then again, that's Loghain in a nutshell, isn't it? After all, he sacrificed everything to drive the Orlesian nobles out of Ferelden and to see Maric rise to power...
In the text below, I try to gather a bit of what is known about Loghain's character from the most important bits of his history and use them to interpret his actions after Ostagar in an attempt to shed some light on the matter:
True, Origins doesn't show Howe suggesting the idea of selling elves to Loghain. However, there's a lot that's implied in the game's narrative and the way the relationship between Loghain and Howe works. The writers won't spell out everything to us, since their goal is to instigate the players' intelligence and allow us to guess what's truly behind the main events in the story. They have to be clear without being obvious.
So what can be inferred from the DA lore and the game's storyline?
We know for a fact that Loghain is an honorable man, a soldier, as he likes to define himself, and a Fereldan soldier, no less. I'm stressing the Fereldan for a reason that'll be clear in a moment. It's highly unlikely that he would consider doing something as morally wrong as selling people as though they were property since this is the most anti-Fereldan thing anyone could do.
Remember, Loghain is a symbol to the people. He is the Hero of River Dane. He was fundamental in keeping Maric safe and seeing that he Orlesians were driven out from Ferelden so that the rightful king could sit on the throne. His military strategies won victories for Maric. Without Loghain, there would be no Ferelden, and that we know for a fact, not just because Ser Cauthrien says so.
He represents the self-made man, the commoner who rose to power through his own merit. Such a man would hardly betray the core principles of his nation's moral system by his own initiative. Even when he abandoned Cailan in Ostagar, he was thinking about Ferelden. As Solas tells us in Inquisition, he saw a general who gazed upon the battlefield and realised the battle was lost. So he spared his soldiers from an early death to fight a longer anad harder battle in the near future. He was thinking about the good of the country in the long term. And when you do that, you need to make sacrifices in the short term, something that most people simply won't understand and will readily comdemn you for that.
Again, the only reason I see as a player for Loghain, a hardcore patriot, to betray such highly-held principles is his willingness to make hard choices and sacrifice almost everything to do what is necessary. This personality trait is evident in both books where his character appears: Stolen Throne and the Calling.
And after Cailan's spectacular defeat at Ostagar, he felt it was necessary to make sure Ferelden survived the crisis. But that can't be done unless the chevaliers are pushed back away from Ferelden's borders and the darkspawn horde is defeated. And the only way both can be done is if the Bannorn realises the need to join forces against the chevaliers in the North and the darkspawn in the South.
But because the Wardens kept secrecy about the necessity for a Warden to be the one to kill the Archdemon and the fact the GW had betrayed King Maric in the past to an Orlesian mage, Rémille, with expansionist ambitions (The Calling), Loghain cared very little for the fate of the Wardens and preferred to rely on Ferelden's own military might and his uncanny ability with war strategy. And because of his retreat from Ostagar and his gross attempt to remove power from Ferelden's rightful ruler, Anora, some in the Bannorn interpreted his actions at Ostagar as treacherous, saw his attempt of naming himself regent in order to lead the country safely out of the current crisis, in spite of Anora being queen, as a grab for the throne and decided to antagonize him.
As for the Banns, they didn't antagonize him necessarily for the right reasons. Some Banns were honest in their fight against Loghain, like Teagan, but as someone stated before in the thread, some would use the Landsmeet to take advantage from the vacuum of power. Most never saw the need for unity simply because they refused to recognise the severity of the crisis going on under their noses. Take for instance the example of two Banns, who only banded together against Loghain AFTER the Warden showed them proof of crimes associated with Loghain (Alfstanna's brother, the tortured noble, Caladius' documents, etc).
And what about Eamon trying to take power from Anora and force Alistair, a commoner and a bastard, to become king? And even worse, a Warden, someone incapable of producing an heir? Does anyone truly believe Eamon was concerned with the welfare of Ferelden by deposing the rightful queen? He complains about Loghain taking power from Anora, but is ready to do the same in order to place a boy on the throne that he can easily manipulate, just as he did Cailan? Out with the regent and his daughter, in with the naive young man who recognises him as family and will listen to his every advice once he sits on the throne? How convenient.
If you watch the Landsmeet carefully and the events leading up to it, it slowly dawns on you that Loghain isn't quite the one with a hidden agenda after all...but it's easier to paint Loghain as the evil villain because of his harsh and inconsequential methods, and due to his association with a man of questionable character and ruthless disposition. Such is the way of things.