Middle class is a family from Zaragoza having a vacation house in Maresme or some extra property in Alicante which were sold for like 20-30K a few years ago, and then occupied, which took them a few months to evict.
The collaboration between scary deoccupying folks and okupas should be common, even if hard to prove, and it's mostly directed on people like this. Many people don't go to police and prefer to pay off just not to see their property ruined.