No need: they are just quitting and getting other/better jobs. Civil servants (teachers and police, among others) aren't slaves after all, they have plenty of options.

Its not like the job is very appealing in current environment. The risk of either dying on job or getting imprisoned due to domestic disturbance calls gone wrong is very high. Not to mention, a lot of cops not showing up situation seem to be in line with the demands of general public who instead want to mental health workers to show up for handling a variety of scenarios.