Sounds like an organized entity.
RICO - Racketeer Influenced and Corrupt Organizations
Examples of crimes that may be alleged to be part of a pattern of racketeering activity include:
Organized, coordinated, and repeated or regular theft operations, including: pickpocketing, burglary, smash and grab, home invasion...
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If authorities wanted to deal with this.....they would. But it's more lucrative to scare the crap out of homeowners, and sell products that "protect" home titles. The ones with commercials at three in the morning.
>The idea that these are random events is questionable.<
Yes, how did the squatters know the house was unoccupied?..........................