Some FReeper, can’t remember who, made a great remark not too long ago.
Something like, when people are in a debate over something and one of them resorts to using the Nazi card, he considered that person loses and the debate is over.
That is what was done here.
I remember telling him that's just what Hitler would have done, and I won the argument because he never replied.
Godwin’s Law of Nazi Analogies.
Google it.