take a look at how their pensions work and and what it costs you and you might reconsider (basically, it's a similar deal to the police pension mafia)
There are legitimate critiques of the perverse incentives of defined benefit pensions, but on the whole I'd say it's better to focus on why the overwhelming standard is for people to not be paid well.
(Police unions are indeed a scourge. But similarly, the amount they get paid is like one of the things I am least concerned about)
And maybe that's fair compensation for someone who has been working a job that literally risks his life, but it's not cheap.