He grew up in a world where he was told what was "right" and what was "wrong". Now he's finding out that things aren't what he had thought they were, and he's in too deep. He's a bit of a coward in the end, but he isn't "bad" necessarily.
Although I'm a Ravenclaw, I love the way Hufflepuffs are so inclusive, insightful and wonderful :)<< I am a Hufflepuff and I am so happy that someone put this kind of think into words. (Also nice avengers reference)