A man you can compare anyone or anything you don't like to.
Do you disagree with someone? Is it especially concerning political views? Hitler is the ever-convenient figure you can always compare them to! Hitler's Nazi regime murdered 6 million Jews, and was responsible for the deaths of over 50 million people in World War II, making him the ultimate embodiment of human evil. But don't let those heavy details keep you from comparing him to anyone you disagree with, no matter how blatantly ignorant of history and disrespectful of his victims it makes you look.
Think government health care is wrong? No problem! Compare its proponents to Hitler. Does drilling oil offshore and in Alaska get under your skin? Just play the good old Hitler card against the drilling supporters. Hell, the comparison even works with rival sports teams you don’t like.
Photos of people you don't like or agree with can easily be "Hitlerized" with the simple addition of a small mustache and swept bangs on the forehead.
President Bush/Obama is just like Hitler because he started a war/gives good speeches.