Medhia is right in saying that there are many Solas fangirls who naively ignore all the victims of Solas' plans because the Inquisitor survived.
I also believe that Medhia is asking from many Solas fangirls is how can you understand Solas and still like him ? I mean if you understand Solas you either will dislike him or will be very wary of him. You can't like someone who plans to commit mass genocide in order to return to and achieve utopia for himself and very small group (the Ancient Elves) - If you do, that's pretty messed up.
Solas does not view people in post-Veil Thedas as people, he views them as something worse than Tranquil. Given how morally ethical people are expected to treat the Tranquil fairly and not just kill them off because they are Tranquil, this renders Solas as someone who is morally unethical. His justification for wanting to carry out a mass genocide because people in Thedas right now are not people to him and he needs to commit this genocide to restore things to the way they were is an argument many reprehensible people responsible for genocides have used throughout history.
As a Southeast Asian, Solas' arguments to bring back things to the way they were before reminds me of Pol Pot who decided to kill hundreds of thousands of Cambodians in order to achieve the agrarian utopia that he and his Khmer Rouge wanted. Its not very different from Mao Zedong's or even Stalin's argument of mass killing to achieve their utopia.
Now some of you might talk about how Dorian and the Inquisitor reacted in the Dark Future and use that as a way to justify Solas' potential actions but this is false equivalency. Dorian and the Inquisitor did not want to destroy the Dark Future that they were in, they simply wished to leave it and return to their timeline. On the other hand, Solas wishes to do things that will result in the deaths of thousands of people to create the utopia he wants.
It only gets worse from here. Solas was willing to let a sworn enemy of his, a blighted Tevinter Magister to possess his magical orb and allow him to use it to kill a highly influential religious leader as well as a whole host of people in hopes that the said Tevinter magister might die and he could then recover the Orb and proceed to do that the Tevinter magister himself wanted to do in the first place.
This is further corroborated and reinforced by how Solas behaved towards the Inquisitor in the Dark Future. He clearly was regretting what had transpired and told the Inquisitor as well as Dorian that "this world must not come to pass". That world is a world where the Veil had been torn apart. Solas wishes to bring down the Veil. Now he may want people to have some final moments of peace but mass genocide is mass genocide,regardless of how nicely you treat those you plan to kill in order to execute your plan an achieve your utopian vision.
Last but not the least, I find it ridiculous that people find it perfectly okay for an Inquisitor to continue to remain friends with Solas. The Egghead lied to you throughout the game and yes a lie by omission is still a lie. True, he did warn the Inquisition of the potential Qunari invasion but that does not absolve him of what he has done and what he wants to do.
Finally, the world of the Elves that Solas talks about is the world of the Ancient Elves, not the world of the Modern Elves, not the world of the Dalish Elves and not the world of the City Elves. Its not very different that the Thalmor doctrine which says it wants to unmake the world so that Elves can return to their immortal ways but they conveniently forgot the fact that this can only apply to High Elves since Orc, Wood Elves and Dark Elves have been fundamentally altered on a biological level by Boethiah, Azura and Y'ffre which means they cannot really revert back like the High Elves can and they leave out how all the humans would die because of this.