Not all children are scared by such movies. I propose we let the *gasp* PARENTS decide whether their own child is mature enough.
Yes, all little children are at risk for trauma from big screen violence. No point in asking parents who have brought the first grader to a midnight movie, because people like that obviously haven’t thought about it and made a decision that their six year old would like it. They haven’t thought about their child at all, he’s like a bag of groceries or an umbrella that they just happen to have with them.