One reason (among many) that I don’t miss Rhode Island is that for the last couple of years I was there I suffered with a melanistic neighbor who played basketball under my bedroom window at midnight. Not on weekends either. According to a book I once read by Nicholas Wade the problem is that they lack a gene that codes for empathy.
Sound of an incessant basketball dribbling could drive one up the wall. There’s no escape from the sound.
Re: lacking gene- I saw a video on a family who has adopted many, many children. The mother is so loving and giving and just goes all out for them, treating them with equal love. As a joke, she went to each of the kids and said she was hungry and asked for a bite of their meal. Every single one of those kids - biological, foster and adopted - immediately got concerned and offered ALL of their food.
Except for two that you can guess. Without hesitation. Just, ‘nope’.
It's not just one gene, but that's generally true of all wild predators. When low-empathy behavior is observed in humans, it's termed psychopathy, but in the jungle, that's the rule rather than the exception.
Most human evolution occurs during tribal warfare. It's the special environmental pressure that selects for improving brain hardware and software at just the right rate, while leaving most other animals in the same environment untouched.
In Europe, Neanderthals and Cro-Magnons were at war for 10,000 years. They were competitively matched, until the Cro-Magnons evolved better thinking and teamwork, and trumped their competitor. The Africans did not participate.
A Troublesome Inheritance: Genes, Race and Human History by Nicholas Wade