Some people are just entitled. I had someone's car once at a condo complex I was living at nd it ended up being a neighbors son.

He sought me out to rip me a new one for it but I stood my ground. He pretty much admitted he told his son to park in other people's spaces but didn't want his son to park in his space so I gave him shit for being hypocritical. I told him it was pretty simple to not get towed, don't park in my space.

I told him it's unfortunate it happened but when I get home from a 10-12 hour night of work and someone is again in my spot despite a sign saying you could be towed for doing this I will have the vehicle towed. Have him go park in the visitor parking like he should have had him doing.

It worked at least because it didn't happen again while I lived there.