This is a strong point. I can see where you're coming from in wanting to fight for the rights of others. It definitely makes Hawke more admirable in that sense.
But what I like about being an aggressive pro-mage, mage Hawke is it's probably the closest you can come in the DA franchise to being a villain, or at least pushing that line as much as possible. You can support and practice blood magic, kill templars, help escaped killer mages (who also practice blood magic), and flat out you can support Anders in his actions, no matter how extreme. I think that Hawke becomes the most unique, since it's not the typical "I want to fight for my freedom story" it becomes more of a "is this person going too far and becoming an extremist" story and I think that's totally unique to DA2.
Damn, I love that. Hello my next playthrough!
That's the one important fact about Hawke as a character that ppl often miss. The Warden and Inquisitor have to essentially be good people for the story to make sense. If you're horrendous it's odd to then have Ferelden cheering for you and your companions congratulating you (even though you murdered most of them).
Hawke can be bad. Can be selfish. Isn't necessarily the hero, just the axis around which Kirkwall spins - so there's much more room for role-playing unique characters. I have a lovely kind Hawke, a selfish idiot Hawke, an 'oh for goodness sake just kill it' Hawke....I hope Bioware explore that type of protagonist again in the future.