I hate bad news as much as the next guy, but in terms of "where is the culture going" wrecks are no worse than MMA (how many re-tweets of Holm's head kick to RR have you seen? It's in the millions) and "bench clearing fights" among $1 million per game athletes.
If I were to intervene to control violence, it would be against intentional infliction of harm first.

As long as no one but the participants are at risk (so far, this is accurate), and they understand what can happen, I'd let it go.