Why do the Police tazer citizens they have subdued and restrained in 4 point restraints?

Question

while in the back of an ambulance on the way to a hospital?
After the case came to the light of justice the police dropped felony charges to keep their arses out of jail.The citizen took the deal so the case was dropped.

Answer 1

some cops don't handle the stress well.

Answer 2

cause its fun to watch them squirm