It is up to you as parents to raise your children as Catholics in this world. Many people who made movies and computers don't let their own children access to computers or movies.
In order to enforce no access to computers or movies, the parents must homeschool their children. Otherwise, the peer pressure is too strong.
Since many homeschooling courses are now found online, older children may have to have access to computers, especially if they are thinking of attending a community college.