Rationally i know that, I just slept through his chapters in the first books. ;)

Daenerys just strikes me as the kind of person who could easily turn batshit insane evil while still thinking she's doing the right thing. Hell, she's basically destroyed the entire economy and society of several cities for what she thought were good reasons. I doubt GRRM is cool enough to pull that off, but I'd love it. It helps that Daenerys is a POV character, i.e. we're supposed to be sympathetic to her and don't expect her to turn bad.
Nah, I'd hate for Aegon to be a bad guy, because that would just turn him into another obstacle for Daenerys to defeat,and that'd be just cheap.