Its good they arrested him. Some areas give squatters all the rights in the world and treat the legal owner like a criminal. I have heard horror stories from the SF bay area.
I have several rentals and its hard not get pissed off about the legalities of the eviction process but at least in my county the judges seem to be pretty reasonable. I have had good luck but it sucks that a dead beat can quit paying and can stay and trash your house for weeks while you work the way though the system to get them out.