This may not be any consolation, but we humans are basically just highly developed apes, and it's simply easier to give in to dark impulses and animalistic behavior than to try and think and behave rationally. Remember what Yoda said-quicker, easier, more seductive... and it's true! Greed and anger are powerful driving forces. The veneer of civilization is much thinner than most people realize, and we all need to understand NO ONE is truly "safe", no matter what propaganda is shoved down your throat. I think this incident proves my point. It is extremely cowardly to stab someone who can't even defend themselves-I think if nothing else, karma will get him back eventually.