"No, I don't think it's the House that makes you turn dark. I think it's the influences you have when sorted in that House, and it's the families, most of all," he answered.
"I disliked Dumbledore a lot more than I liked rules," he pointed out. "Just like I dislike Umbridge a lot more than the rules. I've learnt to despise those edicts even when I think they are good. I mean the one about inspections and permits for businesses wasn't a bad one, except that I'm sure that she's enforcing them the way she pleases as opposed to fairly."
Percy didn't argue the last point, because it was true. You were supposed to be straight, get married, have the children, especially if you were a Weasley. "My mother would have hated us," he said instead. "And before you tell me that my mother would have never done such a thing, she was the one who stopped talking to me because I didn't agree with Dumbledore."