The percentage of these raids that go wrong is vanishingly small. So the fact that it seems like so many are in the news tells us that there are an enormous number of these raids going on.
Also suing the police doesn't cost them anything. The taxpayers pick up the tab. What would work better ironically, would be some Rodney King style civil rights suits that target specific cops. That'll make it tough to find anyone who wants this duty.
The percentage being “vanishingly small” and the number of them reported on FR indicates that there are way too many of them in total to be justified by any sort of “necessity.”