“... police got there just in time, and possibly saving the man’s life.”
If “the man” was going to die, he would already have been dead. The fellow with the bumper sticker was simply defending himself.
Anybody know what the bumper sticker said. Had to strike close to home, or the chump wouldn’t have reacted as he did.
Doesn't matter if the old guy started it. Self defense with threat of lethal force only works if you are acting in response to an immediate danger of serious bodily harm or death. You can't bring a gun to a shouting match. Force must match force. Else the defender becomes the aggressor in the eyes of the law. The young fella is likely in for some trouble.