I don't think anyone's saying that. But the fact remains that, for most of my Inquisitors, Solas is a friend. They can't treat him like just another enemy. They'd never want him to succeed with his plans, but that doesn't mean they want to murder the guy either. Not unless it becomes absolutely necessary.
If they can't, they need to learn empathy for their enemies and how to resist bias with their friends. Because Solas is, and now we know always has been, the real enemy of Dragon Age Inquisition.
Remember ye long time ago at the start of Dragon Age Inquisition? The Breach and the whole demonic invasion? That wasn't Corypheus's plan going awry. That was Solas's plan going right. Solas wasn't tricked out of his orb, some victim of desperation and confusion: he knew what Corypheus was going to do, and why, led him to do it. The Inquistiion's mandate about finding who was behind the Breach? Corypheus might have been behind the Breach, but Solas was behind Corypheus- and not by accident.
I find Solas's ambitions about as sympathetic as Corypheus's- the fact that they both thought they were both dealing with displacement culture shock, believed they were doing something really good for the world, and took it upon themselves to play god to 'fix' things doesn't really change what they're responsible for. Solas expressing a bit more empathy doesn't change that he's a mass murderer, and aspires to even greater atrocities.
Solas isn't someone who screwed up in the distant past, but may commit a deliberate crime in the indefinite future if not stopped. Solas is someone who screwed up in the distant past, but deliberatly initiated the apocalypse a second time not three years ago, and having seen that has decided that third time's the charm, for reals this time.
And I think the Inquisitor, especially an Inquisitor who glimpsed the bad future on the mage path, is uniquely able to empathize with Solas's predicament. Who's to say they would handle being the cause of the end of their world any better?
Me, myself, and millions of other people who don't consider 'genocide' an appropriate solution to homesickness and guilt.
If you're driven by guilt, take it out on yourself- not on (even more) innocents.
You do not save the village by burning it to the ground. You do not recreate the past by destroying the present. And killing perfectly content people is not putting them out of their misery.