He was a nice guy if he knew you, but he was also brash and arrogant. If you put someone like that in an environment with other people that are also there for the power trips, these sorts of situations are the outcome you get.
This is how most humans are. My tribe:friends, Everybody else: enemies, let kill them.
It's Jekyll/Hyde.
But, that's probably true in mid eastern and western countries.
It's generally true when there is no competition or pressure of some sort, when there is competition it's start to bring out the latent evil in most people. That is how authoritarian groups evolve.
On the flip side, there's been a definite trend in the militarization of the police forces and other public facing groups. The first big wave of this I personally saw came from Iraq and Afghanistan veterans joining the public service. Is not unreasonable to think that individuals with a background occupying a country with a hostile population transferred norms from that into their new job.
As a consequence, most cops are good human beings who care about their community.
Instead they made their community less safe by creating even more doubt and distrust in police, in their community, and psychologically injuring the parents and children.