Don't put all the blame on Hollywood. Hollywood produces what sells. The American audience is just as responsible for the filth and garbage being churned out.
Not completely accurate. There is as much a demand, if not more, for good and wholesome family entertainment as there is for the gutter variety that Hollywood churns out. And yet the balance of movies produced is heavily in favor of the gutter variety.
There are two (at least) reasons for this. One, it's much easier and cheaper to produce garbage than it is to produce something of real quality. Two, Hollywood is definately pushing an agenda.