I once heard a great story that I think sums up the nature of human relations. It goes a little something like this:
Once upon a time there was a young man driving his carriage along a narrow road. The young man was an orphan who never knew his father. Still that did not deter him from being a good person. As he is driving down the road, he sees an old man coming towards him driving a carriage of his own. The old man had no son (or so he thought); but that did not deter him from being a good person as well. As the two good men meet in the middle of this narrow road, they get into an argument over which good man should move aside to let the other good man pass. In the heat of the exchange, the young man, who is quite angry at this point, picks up a rock from the side of the road and strikes the old man in his vulnerable head; killing him.
After reading this story, I suspect that you'd chalked this up to another case of road rage. You'd be correct in thinking that. Still, others may recognize this story from the Greek tragedy Oedipus Rex; where Oedipus unwittingly fulfills an oracle's prophecy by murdering his long lost father.
Do you think that Oedipus would've killed, hurt, or even raised a rock to this old man if he knew it was his father?
The moral of the story: get to know the other man.