Its worse actually. Solas was perfectly happy to give away a device of immense magical power to a Tevinter human mage who is also an ancient Darkspawn, all because he was impatient and could not wait to gain back his powers more slowly. For a being that had lived for so long, that is incredibly sloppy and impatient.
Also, If the Qunari were not plotting anything, Solas would not have given a single f*ck about the Inquisitor dying. He only decided to meddle in the Winter Palace because his spies clashed with the Qunari's spies.
There are several problems with this statement. Let's go through them.
Solas, when he awakens, sees the world as sort of a bunch of tranquil, lessened beings. We can relate to this experience when we see our first Tranquil in Origins. Tranquil are people transformed into horrible mockeries. We also see a more illuminating situation with Anders in DA2. He has a friend he meets in the Chantry and the Tranquil "awakens" temporarily then begs to be killed. This nicely puts us in the "shoes" of Solas, so to speak.
1. When he first awakens, it's logical Solas sees killing tranquil beings as humane. Any casualties in opening the orb beyond Corypheus is doing those beings a favor.
Solas, when he awakens, is too weak to open his orb. So, he picks someone he considers abhorrent (and powerful enough) to open the orb. The audience can sympathize. There's really not much to like about Corypheus. From an elven perspective, he's part of a race that hasn't treated the elves too kindly. Living a long time doesn't give one the gift of prophecy. There is no way to take into consideration all contingencies. Saying it was a poor decision is far too easy to say with hindsight.
2. It's a logical plan for Solas to try and kill 2 birds with one stone. He kills a disgusting Tevinter and gets his orb opened. The world is none the poorer.
"Also, If the Qunari were not plotting anything, Solas would not have given a single f*ck about the Inquisitor dying."
This is a purely hypothetical statement. There's no way to test the validity of the statement, "if the Qunari were not plotting anything". This makes it a purely useless statement in evaluating the measure of a character. What if's can go anywhere.
"Solas would not have given a single frack about the Inquisitor dying." There is one way to test the empathy between Solas and the Inquisitor. That would be when Solas has the Inquisitor in his power, he doesn't kill the Inquisitor. Not only that, he saves the Inquisitor.
3. The logic that there is no empathy between Inquisitor and Solas is contradicted by Solas preventing the Inquisitor from expiring, even when it doesn't serve the interest of Solas.