They are, of course. But that has very little to do with being targeted by lawsuits (except that it makes them less likely than they’d otherwise be), just that it makes it very hard to win one against a police officer.
Yeah, absolutely. But still - cops are more likely to be targets of lawsuits than the average worker, so it’s going to be something they’re thinking about, even if the lawsuits are rare and unlikely to succeed. (Though I could see wealthy people filing more lawsuits as purely punitive measures against specific police officers who arrested them, especially if cops were on the hook for the legal fees…)