Free space begets free ideas, free ideas are infectious, next thing you know, they spread and people begin thinking for themselves. Consider these last tweo points. None of us own our homes or are secure from having them forcebly taken from us. Not squatters, not low income housing residents, nor any other class of renters. All are equally homeless.
Most people rent, and are subject to the whims of their landlord.
Those who are able to pay up are buffered from reality by their money, but the same laws that are used to evict squatters are also regularly used to evict renters who are unable to pay thier rent. Homeless shelters are full of these stories. Which leads to point 2. The role of land as a commodity is central to a free market economy, and has been since the industrial revolution. It wasnt always so.