A legacy. Maybe that's selfish. But I've put so much work into mutantkind for decades. I don't just want to be some mutant terrorist who killed Charles Xavier.
I was happy with the X-men, Em. Before everything started being a matter of life or extinction, they were my home, my family, my friends. People I grew up with and raised. I don't want that to be gone.
Can't striving to make this team work be a way of pursuing happiness more than I don't know. Going to a Rolling Stones concert or getting some flashy car?