Not an expert, please search in case of doubt. However, three way I understand is that police can’t remove somebody from “their home”, and they can’t decide who is the rightful owner of the house. Hence, you need a lawsuit.

Wouldn’t work with a stolen car because even on similar circumstances it’s not the same to tell somebody to step out of a car and to leave their home. Also there’s some sort of constitutional right that establish that if you live somewhere long enough, it’s your home. So of you go to the store and somebody gets into your home, it’s easy, but if it’s a holiday home or you are out in vacation, then it becomes harder.

Reiterating: not a lawyer, this is what I’ve learnt just living here.