A man's store burns down, so he goes out, buys a book of matches and some gasoline and burns down the arsonist's house. It's fair, so it must be just. A man sees his children die in front of him so he buys a gun, finds the killer, splatters his kid's brains all over the bedroom walls. That's fair! That's just! Why bother with cops and courts? Let the blood flow in the streets! Don't like it? Get a bigger pair of boots!