;Headcanon
Alex felt it when Charles, Erik, Hank, Logan and Raven (and Peter too technically) changed the time line. He doubled over in the street with severe vertigo and an overwhelming sense of dread.
There’s always consequences to altering realities, especially when you don’t know what you’re doing like they didn’t. Not really.
Things might seem like they’re better, but chances are the reality’s been shattered and warped into something much worse than it’s original path. It’s cruel to say but not all realities can be happy ones, and trying to change destiny is just wrong.
While he’s happy things are better and glad Raven wasn’t tortured, it was still wrong of them to alter reality like that. They got a hammer and smashed it all up. Really who the hell do they think they are to think they have any right to make those alterations?