So your issue is just that the left/right categories are very broad to the point of not being that useful.
You've basically said; why do Christian conservatives in America, support the Holocaust?
Then everyone's gone.. what do you mean?
... and your answer is "well, the German Nazis in 1942, and the American Christian conservatives are both on the right".
Or "why are all these dogs meowing?"... Dogs and cats are both animals, so same thing right?
No, not really. So you're being downvotes because of your lack of nuance.
Why are far left communists pro-Russia... Is a very different set of assumptions than "why are leftists all supporting dictatorships?"
Ha, they misspelled iconic.