Most of the people responsible for the most vicious atrocities in history look, act, and speak like reasonable people. In the U.S., staid corporate lawyer types like John Dulles have been responsible for vastly more human suffering than outlandish super villain caricatures like Trump (not to say he's good). Recently I've been reading up on the history of lynchings and violent strikebreaking in the U.S. - one of the chilling things about that kind of history is the people who ordered or participated in anti-black or anti-labor death squads were usually reasonable, sober, responsible community leaders, businessmen, local lawyers and Chamber of Commerce types.

Always be suspicious of people with power, especially people with the power of life and death.