Well, I share Kohler’s sentiment, but calling the problem dehumanization does us no good. There are no solutions to that problem, which in any case is neither a psychological, criminal, social, political or other designation with any specific meaning.
There are many different reasons for the problem of violence–poverty, inequality, racism–and many names for the psychological problem behind the violence–Emotional Plague, addiction, cultural autism, Wetiko disease, objectification*–and all those have some usefulness, but the one most consistent, scientifically demonstrated correlation with violence across time, countries, states, neighborhoods… is the presence of lead. In paint, gasoline, and now mostly because we’re still burning fossil fuels, especially coal.
How Lead Caused America’s Violent Crime Epidemic
https://www.forbes.com/sites/alexknapp/2013/01/03/how-lead-caused-americas-violent-crime-epidemic/#3b6df68712c4
Besides lead, there are lots of psychoactive pollutants from burning fossil fuels, pesticides, household chemicals, plastics, and other substances–arsenic, mercury, endocrine disruptors, and thousands more.
*read Jessica Benjamin’s book Bonds of Love as a more useful alternative to the “dehumanization” label.