They said it’s cracking down on crime within the train / subway system of which checking fares is a part. So they don’t have them there to just check fares but their job is to reduce and prevent crimes and while they there they check for fares.

One guy skipped fares, he had a history of mental disorders and law violations, and their best course of action is to shoot him, and some bystanders. The fact that both officers shot the guy, with sufficient bullets fired that random bystanders can be hit. Their aim is dog shit.