Iv’e wondered the same thing
I can only conclude that in spite of what they claim they (generally) haven’t done much research and are not very intelligent. And have trouble understanding and/or remembering the same idea that is explained over and over again.
Even if herd immunity wasn’t real. you would think that by now those in the pro-disease camp , would at the very least know the response they will get to the same question asked over and over and over
yet, they do not seem to expect the answer.
I can’t think of any other possibility