The suspect in the car was known to have at least one pistol with a suppressor. That being said, the guy was given a cursory pat-down and could not have had a suppressed firearm on him unless it was in him.

A properly setup suppressed pistol fired from within a vehicle would be fairly quiet, but would sound nothing like an acorn bouncing off a car and you would know if you were hit.

He has no business being a cop if he freaks out when an acorn bounces off a car and taps his vest. Luckily the suspect was not physically harmed and the cop resigned. Hopefully the suspect gets a nice payout from the city.

He's definitely PTSD and not responding rationally to the situation. This person is not competent to hold a firearm.

Not you, nor i, nor the cop, nor anyone experience true reality.

We all experience what our brains cobble together from some sensory inputs, saying "it wasn't as loud as a gunshot" is, at best, a meaningless statement, and at worst, utterly idiotic.

you want to blame something? blame the Police force that hired him, blame the cop propaganda that heightened the PTSD, blame the predominant hyper individualist culture in America, blame the lack of healthcare, blame the commonly held notion that mental health is fake and should just walk it off, blame the fact that the nation fails those who served it at every single turn, blame the economic system that requires you to work to live even at the level of an African substance farmer (fun fact, some regions in Florida are so poor that they live in conditions that make imminent post soviet collapse Balkans seem luxurious), etc...