Imagine this scenario:
I find a vacant unit in an apartment complex, pick the lock, and move in.
Eventually the complex inspects the property and tells me to leave.
I lie and say I am a tenant at the property. They send their security to remove me.
The security guard slips on a banana peel or pepper spray and fails to evict.
They call the police.
How do the police know I am lying? If I successfully defeat the security guard (using proportionate force of course), how does the property remove me and how do they convince the police I am lying?
Obviously, the property can re-key the lock to keep me out. But then I caused them to incur an expense at no cost to myself.