The numbers are ridiculously stacked in favor of vaccines being a VERY good thing, and it is dangerous to avoid them because it allows old diseases to come back. Doubting them is also just insanely ignorant and based on a crock of shit.
Also human-caused climate change isn't a conspiracy theory.
My favorite right wing conspiracy theory has to be Pizza-gate, Benghazi, or the Vince Foster imbroglio. All a bunch of hooey, and proven to be so. The pizza thing actually got a little scary, though, when that nut showed up to that pizza joint fully armed.