Noone ever said that influential has to be a good or bad thing. Hitler is one of the most influential people of the last century especially since World War 2 is one of the biggest event of last century as well. Hitler was featured in Time Magazine as one of the most influential person in the 20th century.
Then again, World War 2 is less than one hundred years ago. Maybe in a few centuries, people will forget about World War 2, and Hitler will be forgotten.
I did not suggest that it wasn't bipolar, and I don't rely on american media to tell me who made the largest difference in this world.
I'd put sigmund freud way above hitler in terms of influence in our daily lives in the realm of the mind. He brought to life many words we now use regulary, such as conflict and ego. The changer and developer of the psychological world. His practices still persist today.
charles darwin transformed our views on the adaptation of living beings through natural selection. The changer of the biological world.
and Einstein, for god's sake. I need not say more. Why would hitler be any more 'influential' than any of these people?
and yea, hitler is more likely than not to be forgotten and his history manipulated as time goes on, while the above mentioned people's theories will continue to incite more research and developments in the real world. This is true influence.