The conversation-killer isn't the application of a reference to Hitlerism. It's the invocation of Godwin's law to squelch any comparison to Hitlerism. The fact

The conversation-killer isn't the application of a reference to Hitlerism. It's the invocation of Godwin's law to squelch any comparison to Hitlerism. The fact that the probability doesn't approach 1 implies that the number of conversations in which some participants veer toward Hitlerism (1) is greater than the number in which interlocutors are willing to rise to the bait. Probably because they heard about "Godwin's law", the most effective tool since holocaust denial to silence people who will call out fascism.