What choice is there? If you want there to be any progress you have to get with the winning team, and with the forces of darkness aligned those hero-types wouldn't stand a chance!

We'll crush them and anyone else who gets in our way.

[Like a dark witch who made him see an illusion of his father, yeah, still bitter about that. Why are you STILL involving him in your plots Maleficent? We used to be on the same side!]