I don't know why people get so upset behind the wheel. If someone cuts me off, I figure they are in a rush.If they are youngsters or ruffians, then I figure it is just due to their immaturity. But I don't see the need to get angry at them. It's nothing personal.
Having said that, I'm probably one of the most passive drivers out there. I give people the right of way, wave, let people get in front of me when they are trying to merge into my lane, etc.