Every conspiracy theory has that one small tinge of probability. This is why there are still people who deny that we've been to the moon. Or, think vaccinations cause autism. Or, that cigarettes don't cause cancer. Or, global warming is just a left-wing hoax to get rid of SUVs.
Anything can be made to sound plausible on the surface. But, to buy it fully hook, line, and sinker, I think that some people are just hard wired to deny every aspect of humanity. It's easy for them to deny everything, except the least plausible ideas. Believe me, I live surrounded by these people down here in the South. It starts with a deep hatred of education and everything else rolls down hill from there. Hatred of science, science, and more science. If it even sounds remotely smart, then nope, don't believe in it.
Want to dance with some snakes on Sand Mountain? You'll find lots of people buying tons of products to get rid of parasites that no one has ever heard of, homeopathy, herbal cures... but, I've always wondered why these folks don't find some alternative medicine to fix their nasty teeth.