"It certainly is a terrible thing when people destroy the environment - but I don't think it compares in any way to the intentional killing that took place in the Holocaust."

Mmmm. "The environment" doesn't just mean trees and animals, it means people, in their millions. The numbers who could be killed are likely to be a lot higher even than the Holocaust. True enough the Holocaust isn't the best analogy, and in fact gets in the way, because it concentrates attention on the differences rather than the parallels. Better to think in terms of the Irish Famine and scale it up across whole continents.

But in the failure to recognise and respond to a looming disaster, there seems to be a perfectly reasonable parallel that can be drawn between our governments and peoples today in relation to climate change, and back in the thirties in relation to the Nazis.
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"...if you don't want to be insulted all you have to do is keep your mouth shut." There's a certain incongruity between writing that sentence and asserting the right to use "Nazi" as a label in an argument.