I see stories like this posted all the time sans audio tape.
The police have a little problem in that they want to keep the public safe but are often not skilled enough to properly recognize threats. For example in this situation something that has been often brought up is that they could have been mass shooters. Number of mass shooters operating as a pair and open carrying nationwide in the US = zero to date. After a two minute chat it should have been 100% apparent that they were not a threat at all.
But if you are the deputy police chief how do you back down from trying to control the situation? Your ego won't allow it.
He then compounded his error by lying to cover his butt. Something more common in public service these days than hamburgers.
Proxima est Mors, Malum Nullum adhibit Misericordiam