Your notion that the word "squatter" is offensive is offensive to me. Squatting is a long, proud tradition whereby property is taken from the greedy or dead and redistributed to those who are actually in a position to use it. Squatters are the rightful owners of property, both in spirit and in many places in law. It is a well established legal precedent that the needs of the living trump the wishes of the dead, and squatting laws were created to honor that.