There is no question in my mind that young, impressionable children should not see certain things that are available to the general public. The safeguard against them getting these harmful images, however, should come from their parents or guardians and not from the government. There is perhaps no right more precious to Americans than our freedom of speech. To start to tinker with that is very dangerous. And although there were many mentions of sex and profanity in the St. Louis students' essays, there were not very many comments on violence.
Profanity is largely superfluous.
While it is offensive by its very nature, profanity is constantly changing. Words in today's vernacular were once considered scandalous in polite society, and vice-versa. I think the real issue here is violence. Sex and profanity will probably play some part in any normal life, but violence should not. Europe has not exactly descended into the pits of hell.