Your reference to Nazis is apposite. I once heard veteran Labour politician Tony Benn destroy an opponent's point of view in a televised debate by saying "That's a fascist idea - it's exactly what the Nazis did in Germany in the 1930s". Thereby he simultaneously implied that his opponent in the debate was a fool for not knowing this and made the suggested course of action untenable by association.
In politics, but also in many other spheres of human activity, we have to ask ourselves whether an argument is being advanced in pursuit of the truth or simply to silence an opponent who could get in the way of reaching an ulterior objective.
Stalin, Hitler, Idi Amin, Saddam Hussein, Robert Mugabe and countless others had a very straightforward way of dealing with opposition. I'm sure that any D6 or D7 disagreement would have been water off a duck's back for them.