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Some idiot intern posting whatever red icon they could find?

I don't think the concentration camp symbol is very plausible either since no one has seen that symbol since 1945.

Can you point to any white supremacist posts or site that use it?

https://en.wikipedia.org/wiki/Project_Alamo. particularly the parts about the A/B testing on steroid.

I don't understand the relevance here. A/B testing in political campaign ads is pretty normal.