What amount of salesmanship would it take for you to sit idly by when someone comes along and announces that they are going to start sending your neighbors to concentration camps? If that person was particularly charismatic, could you be convinced to assist with the systematic torture and murder of a given race or ethnicity? Adolf Hitler earned a reputation as a charismatic, spirited leader, but it takes more than just salesmanship to convince an entire nation to go along with the murder of 6 million people.