I am pretty cynical about humanity, but I don't understand why there aren't hundreds or thousands of swatting incidents per day, given the availability of anonymous communications, payment, and surplus of bad people in the world.

It seems like it would be trivial to set up a dark web service to SWAT on demand. For 0.1 Monero or whatever, place a credible spoofed SWAT call. Maybe hold payment in escrow and follow police radio or blotter to confirm they were deployed and then release payment, or just do a reputational system.