Thinking his people are better than the rest -> CONFIRMED.
Willing to sacrifice innocents in the name of a supremacist ideal (restoring an empire built by only one race) -> CONFIRMED
Believing only his way is a valid way for his people to live -> CONFIRMED
I'd say that's enough evidence of why Solas is not a misunderstood soul. He's dangerous.
He's not trying to restore "things to the way they were". He wants to force the world to go back to the only way he knows because he's unable to live in the new reality.
He doesn't give a DAMN about the elves of today. The Dalish refused his "advice" because he tried to convince them to live according to what HE feels is right for them, while ignoring 1) they are NOT elves from Arlathan and 2) that elves of today have different needs. Needs he doesn't understand and doesn't care to understand.
Take Sera, for instance. He doesn't even try to understand why she rejects elven culture. To him, she's just trash. The few moments he tries to talk to her, he's constantly trying to "correct" her. To force her to act more elven. She's happy the way she is. She is free. She is living in the world of today and adapting, much like anyone should be doing, especially him.
But no. His familiar world is gone and now he feels like an outcast, talking about stuff people don't give a damn anymore.
So he repeatedly feels insulted by anything Dalish and acts like an a** toward the Inquisitor whenever she speaks of her racial heritage with pride.
And because he has the power to change reality to suit his selfish needs, he will. This is unbelievable. He literally shows you the finger, gathers as many elves as he can, a bunch of desperate elves who have been submissive all their lives, promising them Maker knows what to further his unknown agenda, an agenda that will likely destroy reality and ruin civilizations across Thedas and people still believe he's doing it because he's righteous? Because they think he actually cares for the elves? Because poor Solas, he's so misunderstood? But "elves like Sera are wrong and I am right, even though I can't respect her right to live the way she wants to since I don't respect people with a different view of life than mine, because I woke up, looked around and couldn't understand s*** of what's going on the world today? Because I'm convinced I know bettter than those horribly limited, narrow-minded commoners, who don't give a s*** about magic and its wondrous nature"?
And what makes some people think the prophecy refers to him? Do people really believe lifting the Veil will bring back magic to the world? Did you people forget what it did the first time? It DESTROYED the known world.
Now, it might likely cause an even worse tragedy than when it was first created. Lifting the Veil might cause further damage to the Fade, destroying what little there is of it, rip the fabric of the world, maybe even cause a part of Thedas to simply disappear or become a dead zone, thus causing an irreversible catastrophy.
And what's worse: he doesn't even care. The man's so desperate to go back to some irrecoverable past he's willing to risk dabbing with magic clearly beyond his understanding and risk to destroy everything in this one attempt to ressurect Arlathan. It's like an old Italian gentleman who lived under Mussolini, now in his mid 80's ranting against the younger generation while repeating all the time that "things were better in my time, these kids know nothing", when everything is just fine.
Do you know what's funny? If the PC of DA 4 turns out to be the ACTUAL PERSON to whom the prophecy is referring and that the way to fulfill your destiny demands you stop Solas.
I'm gonna laugh so hard if that ends up being the case.
Truly, if Solas wishes to help,he'd tell the Inquisitor what he knows about the Veil and work together to find a solution.
If he wasn't friends with him/her, he'd team up with Cassandra or another member of the Inquisition with whom he got along or with the Sentinels of Mythal and work toward it.
Either way, he wouldn't risk destroying the world and sacrificing innocent people (who aren't even people to him).
He might think he's enlightened and act like that in front of you. Like a teacher with his pet student. But in truth, he's dangerous. He's dependent of a reality that has long stopped existing. Like a drug addict. And instead of struggling to adapt to the real world, he's obsessed with the past and will raze everything in his path by insisting to use an unstable, dangerous magic he doesn't fully understand to further his goal. Does that sound like the actions of a misunderstood, enlightened person to you?