Comparing compensation of cashiers and police officers is unfair in my opinion. Police officers risk dying in line of duty. Would you play Russian Roulette for say $100k? I wouldn't.
[1] https://www.vox.com/2014/12/2/7313827/workplace-homicide-mur...
Talking about risk, would you play a Russian roulette for $100? If you win, you will make $100 in less than a minute, far better hourly pay-rate than a police officer or a pilot.
Kinda makes one feel like money is treated as more important than human life, when you look at it from that perspective.