@spikepipsqueak,
I myself downrep sometimes when I find things offensive, or contribute to little if anything, although I believe we all are prone to bias, and can downrep someone simply because they have a nickname such as "IamaBeleiberJustinlove4U"
Bias? Its basically a blend of experience and prejudice... I believe NONE is without the least bit of prejudice, simply because its linked to the way we learn, racists and such should of course practice the art of "unlearning" from time to time, we all should, but in particular racists and nazis.