This brings up an interesting topic for discussion. I think there are several modes of parenting: hands off, protective, preparatory, etc. I think most parents try to balance these. I've taken the view that for most situations I want to prepare my children for the world they will face given what I know today, be hands off to see how they react, and only protect them as a last resort. While, some kids simply aren't ready to handle the problems they face on a daily basis, mine seem to understand more than you'd think they would. I could see how removing these stimuli from the beginning might be a good idea when you know it is going to be a problem or you want to create a peaceful environment, but I'd really prefer them to make that choice, not I.
There is a balance to strike. Bringing up kids too far outside the norms that society sets can have all kinds of ramifications. Rather than shelter them, I'd prefer them to have things in common with their friends and teach them to make good choices for themselves given their own dispositions and circumstance.
