I guess so - but how does one decide who is lying?

The problem, as I see it, has everything to do with motivated reasoning.

The Horse De-wormer folks demand impossibly stringent standards for evidence
contrary to what they believe in, while uncritically accepting the flimsiest evidence that suits their need. They have gone way too far down the road to Lysenkoism to ever come back. What a pity and a waste. All it does is hamper the chances of ending this pandemic for good.