I do not believe that parents should bring underage children to inappropriate movies. For one thing, I do not believe that children are allowed to be in rated or stronger movies. I'm not sure if it is the law or not but it is the reason why parents wanted rating on movies. There are several reasons why I think it is inappropriate to take children to some of these movies. Some are about the rules, some are about other moviegoers, and some are about good parenting.
The rules state that children under certain age should not be allowed to watch movies with a certain rating. I see that up to a -13 rating, children should be allowed to watch them with or without their parents. Anything above that, I do not believe that children should be allowed to watch. Children under 16 should not be allowed to watch rated or stronger movies because they are not ready for adult situations or features.
Other moviegoers should not be forced to have children enter into movie theaters inside with them because it is distracting. For one thing, children make a lot more noise, often at inappropriate times. They will giggle and laugh throughout the movie. They will move around a lot in their seats causing a lot of noise that is distracting. Sometimes, children cry for reasons other than the movies or sometimes because of the scenes in the movies.