Where do monster lurk?

What evil means to me is something that haunts you or makes u angry. The most evil people is the people are nice on the outside but horrible on the inside. For example the people that act like they are super good friends with you, but then talking or doing mean thing behind your back. A person that is super evil is Hitler. He killed millions of people just people he didnt like their religion. Also people that made up the slave trade, that is super evil. Making someone work until pretty much dealth, for no pay or anything just because of their skin color. That is so