Perhaps they would remove it if they are concerned their platform could be incentivizing wrong, dangerous or stupid behavior and they worry about the brand damage that does or have ethical problems profiting off that.
But if you're going to ban dangerous/stupid video someone has to make that determination. And you can be sure that there are a ton of activities that are dangerous/stupid in the eyes of some people (even understandably so). BASE jumping, wingsuits, really any kind of extreme sports, stuff with explosives, etc.
People were doing stupid stuff before YouTube existed. As long as it's legal (which this stunt was not) who cares? Teach your son why he shouldn't do that kind of stuff instead of turning to censorship.