As to your demand for a "source" -- as if there's a scientific paper I can cite -- there are zero rational people who can read what I wrote and seriously question it, beyond weak HN trolls who have nothing.
It's uncomfortable for sure, though: Knowing that one's entire position about complex topics (vaccines, AGW, etc) is dictated by tribalism is pretty embarrassing when one really thinks about it. Particularly if one has blanketed it in lots of ridiculous rationalizations and explanations -- a legacy of nonsense -- carefully curating their YouTube channels of disinformation.