Why do Mexicans bring their children into R-rated movies?

Every time I go to see an R-rated movie there are always mexicans there with their young children, even babies! Then, when there is a very scary or gory part of the movie the children scream and cry and interrupt the movie for the rest of the theater. Why do they want to expose their children to such violent and scary things at such an early age? Never mind that it disturbs the rest of the theater when they cry and make noise. Is it a cultural thing or something? I don't mean to pinpoint the Mexicans for this but I have really only seen them do this and not any other ethnic group nearly as often.