> I definitely feel like there can be a pipeline where one extreme belief may lead to others

Once you accept a premise that majority consensus of well informed people can be drastically wrong, it's not hard to then transfer that horizontally from one domain to another. So if you accept the possibility that scientists made up climate change - why wouldn't they also make up COVID? or falsify risks associated with vaccines? or any other number of things.

Underpinning all of this is some basic elements of humility and empathy - willingness to accede to a greater authority of others, and to weigh others experience that is different to yours as important in informing your views. Cutting those tethers gives your own belief system a new degree of freedom.