As far as training goes, you have a point. Park Rangers probably aren't trained well in domestic matters. But this wasn't a running fight between two people for forgeting to bring charcoal for the BBQ. It was one irrationally behaving individual with a deadly weapon.
I'm not generally a 'shoot to kill' person. In fact, I've been called some things for not supporting a cop shooting a suspect. But this time I can see it clear that they were correct.
The standard for a threat from a knife is 21 feet. Meaning that if a suspect has a blade, and is 21 feet away making any move to get closer, you can shoot. It can take less that 1.5 seconds for a man with a blade to cut your throat from that distance.
I can't see much difference in a club. A whack upside the head can be just as deadly, and can happen as fast as a knife to the neck.
Okay.
And I really like your tagline.
Actually, Park Rangers are well trained in handling domestic disputes. Think about it, a campgound is a small city. A small city where a lot of the inhabitants have been drinking and partying.