if you read up on the guy, you'll understand a little more.
also, some news stations at the time showed the entire video to the public, some didnt, everyone saw it, women, children, men. in some places kids were at home when it happened, and saw the whole thing so i would think a bunch of high schoolers would be able to handle it. its history, look at it as such.
plus, i know for a fact that you've seen so much worse deaths in movies. get over it.