Wow! This is a terrible, terrible situation. Hopefully the criminals will get whatever the full punishment of the law can bring.
*Time for me to go off on a tangent* One thing I wonder (and this in in no way blaming the victims), is why weren't they prepared for this? When you have worthless pieces of trash like those squatters threatening you, you had better take it very seriously. I mean, the police are of no help in a situation like this, realistically speaking. You can make complaints, but unless they can catch them during an act, they can't/won't do anything.
I think most members of the forum know or know of people like these killers (I don't necessarily mean know or know of actual killers, but people of a certain type). These are people you don't want to mess with. If they or you start something, you had better be prepared to finish it, because they will. In a situation like this, laws don't matter, it's kill or be killed. A deputy can't help you when nuts with baseball bats come crashing through your home. If it was a situation with 6 people in one house, I'd have had a gun and had someone (or two) stay up during the night, standing guard until the squatters were in jail for good or whatever. With threats like that and in a situation where you could have people up and guarding the house, that's what I'd do. Sure, having a gun doesn't guarantee you'll live, but at the least, you'd be able to kill a few of them when they broke into the house.
Laws and morality are fine, but if someone threatens you like that and they make any move to act on it, it's time for them to die, otherwise it'll be you. That's not vigilantism, that's self-preservation. In situations like this, you have to look after yourself, because cops and judges won't be. And the criminals (squatters in this case), certainly don't care about your well-being, so don't worry about theirs. When a criminal threatens/acts like that, all bets are off and you have to do what you can to make sure you're alive at the end of it.
Now I know some would object to all that, but if someone like that were after me, if it was at all within my power, if they acted, I'd kill them. I'd feel bad about having to kill someone, but they brought it upon themselves and it's better to have bad dreams than to be in a state where dental records are of no use. *end of tangent*