David Livingstone Smith said this quote
“ Dehumanization isn’t a way of talking. It’s a way of thinking—a way of thinking that, sadly, comes all too easily to us. Dehumanization is a scourge, and has been so for millennia. It acts as a psychological lubricant, dissolving our inhibitions and inflaming our destructive passions. As such, it empowers us to perform acts that would, under other circumstances, be unthinkable. ”