Step 1: Obtain Child.
Step 2: Purchase sensory deprivation chamber.
Step 3: Feed child sugar-free flavorless vitamin-paste.
Step 3a: Marvel at the fact that the kid survives with no fibre without his guts rotting out and digesting themselves
Step 4: Continue until 18.
Step 5: Release perfectly happy child out into the violent, obscene world.
The point isn't taking kids out of the world, it's teaching them the right attitude about it, and I'm sorry - but games don't give a valid world view. At young ages kids don't really know what's right or wrong, and if you let them play violent games or watch violent films they will get a warped view and it will be harder for them to know right from wrong.