Because their jobs financing is mostly perception based.

Crime can be at an all time low, but all it takes is a politician to rile up the population about murderers and law enforcement and incarceration will end up getting more money.

Be seen as being ineffective, soft or incompetent, especially by those holding the purse strings, and people lose jobs to those who will toe the line.

This is a message to the wealthy “look how seriously we take serving you”