It depends on the situation. I make a really strong effort to stay calm when someone makes an honest like making a left through the intersection in front of me...there are reasonable explanations like they were surprised by your speed.

Then there are other instances that I consider a half step away from attempted murder. People with sp little regard for others safety they think it's ok to blow by within inches of you while doing 20 over the speed limit, or flooring it at a light to make a right hand turn in front of you when they clearly see you moving into the intersection. Instances like these I'm thankful I've never had the opportunity to meet the person again at the next light because the bike lock would probably come out to abuse mirrors or something, it would escalate, and I would end up in trouble, regret my actions, or both.