Any officer paying attention would know you won't be punished unless you act particularly egregiously like the one officer in Louisville reassigned to desk duty (big whoop). Add on the amount of animosity stoked by the president toward media for the past 4-5 years, and it really doesn't take a simultaneously coordinated effort to have this outcome.
Isn't this honestly largely due to the police union rules and contacts, which (unions) are a key part of leftist labor relations?
No police union contract includes a statement that the officers are immune from criminal investigation and prosecution, and most of the egregious events would clearly result in investigation and prosecution (if not necessarily conviction) if done by non-police. That these cases don't get that far shows the effects of a general cooperation between police and the judicial and political system---DAs don't prosecute and courts won't convict---all backed by a social system that encourages that behavior: you won't get elected on a police reform platform anywhere in the US.