What is the main thing that is causing the moral decay in our society?

I can’t help but notice that our society has been going downhill in a moral sense the past few years. Just look at the crap and garbage that is allowed in the media today. I happen to know that 20 years ago it would have never been allowed. People seem to believe in nothing these days and seem to have adopted this if it feels good do it mentality. I don’t see it getting any better either.