They don't need as much training since if they screw up, they have the FOP and their lawyers to protect them.
There is almost zero risk of jail time or loss of personal assets.
The worst thing that generally happens is reassignment to a desk job, or they get fired, and have a good chance of hiring on with another agency.
On the other hand, if Joe Q. Citizen had behaved in a similar manner, he would be facing felony manslaughter charges, along with various firearm charges.
Welcome to the emerging Amerikan police state.