Alignment is fundamentally flawed, since Good and Evil is subjective in the real world, but is part of objective reality in Pathfinder.
There are actual planes of reality in Pathfinder that embodies Good and Evil, there is actual, living gods that are arbitors of what is right and wrong, that can communicate this to their followers.
What they say is bad, is bad.
Changeing alignment for Outsiders, who are fundamentally bound to a certain one, should be just as easy for them as it ould be for a Marid and an Efreeti to change their respective elemental alignments.
Mortal intelligent races seems to have free will, and should have an alignment that matches their religious, social and cultural upbringing, with some excptions, if there are races that have not evolved empathy for example, then they would have a hard time being Good aligned.