Okay, so what do you think of what they say?
I don't really distinguish between people who "do evil because they think it's a good moral reason to them" and people who just "do evil." I think that's not especially common, but when all is said and done it's just a very weak excuse to me, even if sort of technically "true" on some level.
I think that's why I called him "chaotic evil" it's chaos as much as evil, maybe I'd say he was higher on the chaotic scale than on the evil scale. I mean you could even say he's Chaotic Neutral (almost like a mad scientist) and in the case of DA that ended up being a lot of evil I suppose.
In no world do I see him as "good aligned," but I suppose, I don't know, given the right environment and circumstances, a situation where there is no break with his personal past that he is so attahced to, a nice Elven Palace or whatever all his needs are met and there wasn't any problem to begin with, maybe he doesn't try and tear the world apart (since he's "Chaotic neutral).
It seems over the course of the game, you learn that Solas isn't, itself so disruptive, but is hyper-reactionary towards things that disruptive towards him, such as in the case of the clash with the spirit mage and such.
But honestly, like I say, just my opinion,
And for the purposes of the game, things do go wrong, and he does a lot of harm. The fact that he appears on some level, to relish the destruction in an angry sort of way, and appears to state clearly that the loss of life is no consequence, for pretty obviously not good goals, is why I assigned "evil" as a characteristic, but I guess, since you are pressing the point, I think Chaotic Neutral is perhaps somewhat appropriate as well.
At any rate, regardless of intentions, needs, whatever, for the purposes of the game, he does a lot of harm, similar to other "evil" characters, perhaps even more than those that intended as such.
And for my purposes, that isn't appealing, well, to say the least, it's downright mega terrible, regardless of the reasons behind it.