It's interesting you skipped a few examples in the parent comment's point, but to pick one: the apparent quorum of that "big tent" you speak of has resulted in an outcome where the sitting health secretary of the US is openly a believer in the miasma theory of disease.

You can point all these distinctions inside the tent as much as you want, but the reality of this is that conservatism in the United States is everything the parent comment said and more.