These little thieving bastards may have immunity from the courts, but if they keep this up, they may find that natural justice is not so forgiving.
We get more of what we put up with, but people will only put up with lawless punks for so long before they snap, and the beat-downs begin.
I suspect the Roma are pretty good at figuring out when their welcome is actually worn out with the local citizenry, and disappearing right about that time before the heat turns up too high.