I would just like to point something out...actually a couple things.
since inteligence is not at all genetical as are other things that can become factors(alcoholism,etc)we do not need to filter out all the stupid people.
it is a waste of time to be sad over someone you dont know dying, there is enough greif coming from those who love them and it is your responsability to be happy, to help maybe let them move on yknow?

Also, i also do some stupid stuff to show off, and i know what the consequences will be. He knew sooner or later he might die from these kinds of stunts, but if he didnt it would make his life seem fuller. Some people are just like that. They know the risks, the possible outcomes, and think its worth it to take their chances.