I try to resist (although I do not always succeed) dehumanizing those who engage in dehumanization/oppression against others because I know that it is too easy for dehumanization to embed itself in more widespread ways in my thinking.
It readily entwines with thoughts entwined with anger and fear, and becomes increasingly easy to apply in any situation.
Dehumanization carries a basic kernel of hatred and anger, "tagging" it for more widespread application in my thoughts and emotions.