He is the reason there are tranquil. That there are mortal elves. That there are mages and mundane. Every mage/templar conflict that has ever happened has happened because of what he did. He is at the very heart of the calamity that changed the world forever, forever ago. He did it to prevent something he felt was
even worse.
If you know all that, and can still see the good in him, how can the death of one elf change it all?
I think it's just another mirror that this whole game has been trying to show us - the them and us thing. The Qunari on the dreadnaught vs the chargers. The red lyrium poisoned world of the mage future vs the world we know. All the elves that perished when the world was ripped asunder, every elf now that dies of old age, they're them. It's easier to look past them and love Solas. If you grew attached to Felassan, he became an us. He makes it harder.
Except, Cole said he was a friend. He was already an us to Solas. To me that says Solas is capable of a no-compromise for the greater good attitude that no character I could play can ever be. He thinks it is worth it. And because of that, nothing can get in the way. It will all be better in the end. It has to be. That must be what is going through his hairless head over and over. Or perhaps...
Perhaps that's the part of himself that he gnawed off to escape the trap. Temperance is the virtue that allows us to weigh self-interest against the greater good. It should never be all one, or all the other. If he sacrificed part of that virtue to escape the veil trap, then whatever he left behind has him placing what he believes is the greater good above every single other thing. Even friends. Even a Lavellan he loves. We matter to him, that's why he's so sad and hurting right now. But we also can't matter.
Maybe an inquisitor that he loves or respects became the missing part of his temperance. Maybe that's why we are the only ones who have any hope of stopping the utter end of our world without killing him. Really sorta makes one pity those that reinforced Solas' initial reaction to our world and got the
Ugly Kid Joe version of Solas, and those who chose to stop Solas with a sword/bow/spell instead of a change of heart. I mean ya'll saw him blink and turn a whole Qunari to stone, right? Rawr.
Then again, I suppose we all still have to get to him first.
Well! Good luck everyone!