The left has some of this, but I don't think it's quite parity. Even polls on positions before and after this president* "won" show that the Democrats mostly stayed unswayed on many key issues, while the Republicans were basically reprogrammed on key positions. 


And while the left has its vaccine deniers and a strange, nearly superstitious, reaction to nuclear, vaccine denialism is not entirely on the left. I know extremely far right reactionaries that also don't vaccinate. And the original resistance came from Christians that thought getting a disease was "God's will" and something like vaccines was thwarting that will. Obviously, most xtians rejected such extremism...thankfully.