Okay, so I'm backtracking over to Peri's origional question. Sorry!
I disagree with basically everyone (teehee, I'm an outcast!). I honestly don't think we know enough about Rodolphus to judge him. I mean honestly, the guy's never said a word in the entire series. We can't judge him when he's only been mentioned in 'massive breakouts' from Azkaban. Sure, Bellatrix is rough and evil, but who knows? Rodolphus might be worse.
Just my opinion on the topic.
Actually, why do you all think that Rodolphus was quiet?