The problem was that it mostly started being brought up for the purpose of political propaganda. Trump's only use for the pandemic was as fuel to rail against C

The problem was that it mostly started being brought up for the purpose of political propaganda. Trump's only use for the pandemic was as fuel to rail against China in support of his predetermined agenda. So "lab leak" was used to focus attention on the external enemy to fight, instead of taking care of our own country or asking why Trump was so dead set against that. The whole time, it was obviously wrong to reject the lab leak theory out of hand. Yet people are stupid herd animals, and instead of tri-state "it is irrelevant in the current context" they argued that the theory was definitely wrong. That same fallibility applies to people working for institutions (see also the early CDC lie implying that masks weren't effective, based on wanting to keep the supply for the healthcare industry). Then after the dust settles, people stay dug in and the politically-colored battle lines never go away. I'd say this kind of establishment-clearly-wrong but dissent-with-nothing-productive underlies most of the energy fueling the destructionists.