"We do not need to get good laws to restrain bad people. We need to get good people to restrain us from bad laws." GKC
When a law is evil the mental gymnastics needed to keep convincing yourself its moral is something you need to do every day and leads to a society that borders on insanity.
The only entity that keeps us tipping completely over the edge is the Catholic Church. Or as GKC said "We do not really need a religion that is right where we are right. What we need is a religion that is right where we are wrong."