I think it definately does affect the judgements. I remember telling my friends what a jerk my dad was on numerous occasions and no one would ever believe that to be true. He was/is a charming guy. Then when his wrath was focused on them they would finally understand. That probably affects my judgements. I try to take things at face value though. I dont try to read into if someone is exaggerating the story or anything.

More than that though i think what gives my bias "ooomph" is that i feel the need to voice my opinion if i feel someone is being picked on/singled out. That gets my blood flowing.