It would make more sense for the children who refuse to learn to leave the school system, instead of those who really care being forced into looking for alternatives. I would never choose a movie for them by the rating system alone, and believe that censoring books because they contain something that might offend someone is ridiculous. I guide my children through their choices by explaining to them what they are about to watch, or read. I have done this with my kids since they were old enough to understand a simple sentence. If you try and protect your children from every bad word, or unpleasantness that comes along, your kids are going to have a hard time adjusting to the real world.
Violence seems to be everywhere.
This is nothing new. Read history, it's always been there. I feel it is better to be prepared, than to walk right into it because you don't like to admit that it's there. Don't underestimate your children. If you have taught them to be sensitive and caring they will not be reshaped by TV, movies, or books.