Good guys are the only ones with a sense of humor. Good guys will only get shot in the arm or leg. Nothing cures the blues like killing 30 or 40 bad guys. Good guys don't take drugs. Heros wear clothes that dirt can't stick to.
Ugly people are always bad guys.
Bad guys will make elaborate inventions to kill the good guys, but they will never stick around to see if it works. The bad guy chickens out first. The police are smart. Undercover cops are too good to be spotted, especially when wearing dark sunglasses. All police killings are in self-defense.