I can't view the video til later today but, the OP question is worth a lot of thought.
On one hand, I agree that it's everyone should lend a hand to a safe playing environment- i.e. if you see unsafe behavior that the refs are unable/unwilling to address, you should step in.
On the other hand, we do not have any authority and, even further, our assertions may be undercut by the field staff, or gray areas (i.e. dry firing in the parking lot is not allowed at some fields and allowed at others).