The most violent behavior to which I was exposed as a child was on the football field. As a young adult, however, when I entered the US Army, I was soon stabbing my bayonet into dummies I was told to imagine to be enemy soldiers, while screaming KILL at the top of my lungs. The same kindly policemen who once gently urged me to be non-violent and productive citizen, now urge me to arm myself against the predators from whom they can not protect me. I not only feel strongly that it is a terrible mistake to shelter one's children from the sordid details of life, but I have personal evidence to prove it. The children of the commune in which I lived during the sixties, who were exposed to far more drugs, sex and violence than the average child of their day, are now all adults with children of their own.
None has a drug problem.
Unfortunately, however, like us and our parents before us, they do not truly appreciate how much the world has changed and how fast it is still changing. Do NOT censor what your children are exposed to on the Internet. Do NOT forbid them from learning about drugs, sex and violence. It's a hard, often dangerous and shocking road to travel. In the end though, we will all be better off for your efforts, especially your children.