"Unfortunately, despite 14 years of being a police officer, he couldn’t just ignore it. Maybe because he had been putting up with that stuff for too many years; maybe because he had other things on his mind that night. For whatever reason, he ‘“lost it”."---This is garbage. He's probably been getting away with that kind of abuse for YEARS--and his fellow police officers. 
"Maybe because he had been putting up with that stuff for too many years"---it's his job to put up with that. And if he can no longer perform his duties he's obliged to quit but I bet he likes the pay and the pension and "benefits" he gets--like getting to choke people and throw them on the ground.