Testing Godwin's Law
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At least that's how people seemed to understand Godwin's Law back in the Usenet days.
(Of course, the dynamic would be different nowadays, when Godwin's Law has been part of the "received wisdom" for decades.)
I've never liked Godwin's Law much, because it's trivial. Another way of stating the identical concept is: "it is not impossible to make a comparison involving Nazis or Hitler". The version you describe would at least have some non-trivial component to it, but e.g. on its Wikipedia page I don't see any reference to usefulness of subsequent conversation.
It is ridiculous to suggest that any mention or comparison to Hitler or Nazis is automatic troll.
These were important historical events, and it is essential we keep talking about them and always remember what happened.
If someone or something leads to Nazis or Hitler, that needs to be pointed out, not shot down. Otherwise, we end up with Hitler and Nazis.
The thing about hitler/nazi comparisons is that it is more likely than not to be a "shooting twee-twee bird with AA cannon" comparison. So out of proportion to the topic that even hyperbole do not start to cover it.
But then the internet age seems to have lost all sense of nuance. There is no like or dislike, only love or hate, etc. And don't "you" dear claim indifference, that is going to really fan the flames.
That’s a staggering amount of Hitlers and Nazis in various forms, but it’s still a relatively low frequency — 1 out of every 1,500 submissions — which Hoppe believes discredits Godwin’s Law. But a few other findings surprised him: Hoppe found that comments on a Reddit post typically peak within hours of an item’s submission, regardless of whether or not they fall victim to Godwin’s Law, and that Nazi references often crop up early in the commenting lifespan of a post. “What this means is that conversations keep going,” he said. If playing the “Hitler card” in an online conversation really does effectively end it, as Godwn’s law assumes, Hoppe’s analysis should have shown that Reddit’s Nazi references come toward the end of a thread. Instead, he found the opposite.