Because we’ve been provided with proof that most of them are tired of fighting. Even during X-Men #1, we see Storm tired of having to clean up messes but never tired of lifting up mutants. I think it’s because they now have a pretty good picture of what happens when the worst thing they had to deal with is a forest fire.
And it didn’t really affect the reading, IF were talking about my enjoyment. I mean I was eventually tired of the extinction stories but that’s because it was draining and repetitive. As far as reading those stories, I still loved them but I just saw more validity to what Magneto was preaching.