The opposition to the idea comes down to one thing 1)Donald Trump et al supported this hypothesis, and thus disagreeing with the hypothesis becomes reflexive for many.
Just shows how politics have divided us. No one seems to be thinking independently and that includes myself - I try but often the first reaction is otherwise.
You can despise someone deeply, but if they are citing facts, reason, logic, etc - have no association, they stand on their own. Doesn't matter who uttered it.
