He dislikes being a mutant and chooses the avengers who have never cared for the mutants until now over his own damn race and brother.

"Scott is a delusional egotist"-Havok

Scott sure is a delusional egotist. Doing things that make your closest friends and family unable to look you in the eyes to protect them and the rest of your dying species and sacrificing everything to save them sure is egotistical. So is using vast cosmic power you got due to the incompetence of your oppressors to try and make the whole world a better place until you're driven mad by losing control of the cosmic power because people constantly harassed you for doing good stuff with the power and then going to jail despite being right about everything with a smile on your face because you couldn't care less what happens to yourself as long as your people are okay while the other side have their panties in a bunch over who "won".

Unlike Alex who monologues about how much his life sucks over the comatose body of his mentally devastated girlfriend.