Paleolithic atavism.
At 73, I'm more and more convinced that the genetic traits from that prehistoric era still exist in a number of individuals among the human species.
They are what the DSM5 calls sociopaths/psychopaths, functionning on mostly reptilian brain structures, strictly aimed at preserving individual survival, to the detriment of anyone/thing that's in their way.
The only intelligence I credit them with is duping tactics, derived from instinct, not from thought.