Oldman hit it on the head.

If someone took the time to make a movie about it, USUALLY its because they are trying to convince you to believe what they believe. Not any different than your mom pushing republican on you.

The best advice, IMO: Free thinking. Look at the big picture, realize that there are some crazy people out there, and some smart ones too. Do your best to make up YOUR OWN MIND about whats REALLY going on around you.