Satan is the present ruler of the world and sets its course (in so far as he is allowed by God). Given that, we should not be surprised that every book, movie, magazine article, TV program, and newspaper is used by him to accomplish his objectives.
A Christian parent can try to shield his child from all the evil in the world, limit the exposure to evil in the world, or allow his child to be immersed in worldly media.
We find that gradual exposure to worldly media with critical instruction helpful to our children in learning to recognize what contaminants Satan has introduced and why.
There are some universal themes Satan allocates so many resources to that he reveals what is important to him.
1. From the Boxcar Children to Harry Potter, it is very important to Satan for Children to learn that they are on themselves and cannot rely on a parent to help them.
2. We can observe from every TV program that a man needs a woman to instruct him, correct him, and protect him.
3. Sexual perversion needs to be tolerated and protected.
4. Divorce is only natural when "things don't work out".
5. "Hooking up" (fornication) is expected.
6. A woman (or a man) only has real value by their appearance and if they can visually present themselves in such a way as to solicit interest from others.
7. The collective (government, work, school) is the only practical foundation for faith (that which will provide and instruct).
8. The "science" of evolution, global warming, psychology, and sociology are all upheld to silence any objections to the progress of global socialism which enables Satan to collectivize the entire world.
There was an episode of Community College on TV where a man said, "I'm sorry, I have been programmed by TV to expect any black woman over 50 to be a cosmic sage".
Satan even allows a little truth to slip through disguised as humor. That was the function of Johnny Carson, to use humor to get everyone to laugh at what was happening in society. It is called "sugar coating".
The main trouble is that most Christian parents do not fully understand what is happening and have little of value with which to instruct their children. The question becomes what to allow children to see rather than how to instruct children as to how to recognize the schemes of Satan.
Satan has influenced churches so that their structural design is primarily as organizational collectives and as such resonate with and are drawn to the collectives he has established for everything else. The people who reside in such churches often find themselves drawn quite deep into worldly entanglement before they even begin to question what is happening. We can see this in churches that have a split over whether to endorse active homosexuality. We should not feel glad that some recognize this as wrong, but ashamed that everyone was asleep until this point.
The solution to this problem is not a list of which movies are good, but a closeness to the Lord that gives us the wisdom and discernment to know what is wrong and why. We can instruct our children so that they grow more discerning than we were, but we need to understand that everything begins and ends with Jesus. He is truth and the wisdom of God.