Yes, very illegal also, if you can show it in time, best approach is to call 911 and say your house has been broken into. If the door is smashed or something, it will be obvious.

But ya, we are approach “lawless enough that the law doesn’t help protect you against squatters” and “lawful enough that the law makes it very hard for you to act on your own against squatters.” Remember, you have financial things to lose, these people squatting generally don’t (besides their freedom, and they usually get out of any time).