It may alleviate some performance anxiety in a high pressure job with huge responsibilities, but is up against a range of management decisions like quota based policing and other systematic factors influencing policing away from stewardship in a community. Trying to reduce it to a single factor may be simplistic given the complexity of the problem.
It seems for the US it's not, there's groupthink that some citizens are the enemy and they're hungry for police blood. That's why they say "thin blue line" or "cops lives matter", and they aren't even being ironic.
People learn by example. Either you give the well thought out patterns of behaviour with training, or, they learn them in the field. So, with proper training, they would not necessarily have to have to mirror the learned bad habits of others.
