After Rogue had had to run away from home because Mystique couldn't admit that she couldn't help her control her powers?
She ran away because she thought Xavier could help her.
She created and led an incarnation of the Brotherhood of Evil Mutants for heavens sake, then when things looked bad for them, she turned tail and became a Government agent (Hardly speaking volumes for her committment to the cause of mutant rights, and speaking to a more pronounced sense of self-preservation).
At the time she still had the human identity of Raven Darkholme, who worked for the Defense Advanced Research Projects Agency. If she only cared about herself, she could have easily disappeared and let the other members of the Brotherhood fend for themselves instead of making sure they were protected.
Then as soon as that went south, back to the self serving villainy.
Actually, no. A lot of stuff happened after the dissolution of Freedom Force before she returned to her old ways.