He is a truly despicable person.
A sociopath; sadist; and God only knows what else.
The fact that we have tolerated his type for this long is unforgivable.
The fact that he is not alone is a proven statistic.
Approximately 1/4 of the people around you have no (read that zero; nil; zilch; nada) conscience.
That isn’t so hard to believe. You still may not know one of these folks personally while your neighbor may know four or five.