This false equivalence falls apart as soon as you assess how widespread such beliefs are and whether they’re based in verifiable facts. There are leftie conspiracy theorists but there’s nowhere near the spread, especially at the senior levels of the party.

For example, Birtherism was easily disproven but persisted for years among a high percentage of Republicans and even among members of Congress, the current President, and many of his appointees. There’s nothing remotely equivalent on the Democratic side - you could probably find someone saying just about anything you imagine but they’re at the fringe rather than making official government actions based on those beliefs (remember Benghazi?)