Here is a link to the US film rating system: http://www.mpaa.org/flmrat_ratings.asp

It seems the Brit rating of 12A is just about identical to the US PG13.

I tend to agree that the exposure to graphic violence from all media sources can't help but desensitize some to such behavior. Another reason why proper and responsible parenting is such a tough job.

I believe we can lay this one at the feet of "freedom of expression", "freedom of choice", and the big one "freedom to profit". Why do they censore graphic sex more than graphic violence?...it's those dang Puritans