Law enforcement in Tulsa has gone into the toilet in the last 18 months, since they settled a lawsuit with a group of black police officers. The settlement was so bad that the original plaintiffs offered to just forget it, but the judge wouldn't allow it! Now every action by every police officer has to be logged into a database, with the race of every participant prominently mentioned, so the whole force can be analyzed for "discrimination."
You can imagine how diligently the police are patrolling downtown at 4:00 a.m. (/sarcasm), and it's not really surprising that business owners would be getting angry and stupid.
(I'm attributing law-and-order intentions to the bar owner, perhaps wrongly.)
Maybe not wrongly. Police are often scarce at 3-4 am. It appears the bar owner felt the "need to do something" - hence the brass.
The moral of the story is, "If you think you're a vigilante and wanna wear the brass, make sure you're in the right and can back it up with @$$."