Typically it comes down to two main explanations; it's an attempt at depopulation or a plan to put microchips in your body for either surveilleance or control. The notion of depopulation isn't that conspiratorial given what has happened
before, the conspiracy aspect tends to be that it's disguised as a vaccine and dictated by a shadowy cabal of elites. Which then tends to get tied in with the Gates foundation being "
on trial for illegal vaccination" and another web of loosely related and mostly false ideas.
I'm doing a bit of research into vaccine hesitancy at the moment and the thing that seems to be coming out of it is that our perceptions of anti-vaxxers are essentially a bit naive or self-gratifying. To me the key takeaway is something that was touched upon
here. The way we think about vaccine hesitancy and conspiracy theories tends to be very black and white – people either do or don’t believe in them. The reality is actually much murkier.
Most people don’t really know what to think about these complicated ideas, and they’re swayed in the moment by targeted information or misinformation, and unless they’re forced to, people don’t look into things much beyond that. They can flip-flop about from these two supposedly contradictory ideas, because they never
really believe either of them, they just place their trust in people – sometimes experts, sometimes neighbours, sometimes anonymous online “influencers” – to do that thinking for them, and they make temporary judgment calls. They don’t identify with these beliefs, they’re just passing ideas, completely irrelevant to their day to day life and their worldviews.
If you see that photo, have it followed up on with some reasonable-looking web links, and then speak to someone else who believes it, it's surprisingly easy for that just to become your adopted view. Unless you're incentivised to assess all of the evidence and identify that as misinformation, you're content just moving on from there. And because conspiracy theories make for better stories, and we're just programmed to love information framed in stories, it's quite hard for the boring truth to win the argument.