Michael, I expect it’s caused by the “United Nations depopulation programme” / Agenda 21 conspiracy theory, which is related to the “MMR vaccination causes autism” conspiracy theory, and anti-vax in general.
Basically it promotes the idea that the “world’s elite”, AKA “them”, have been planning to kill the majority of the world’s population, that the Club of Rome set out this plan under the name of Agenda 21 (which is a genuine public document), and that this plot is to be implemented by the United Nations using its supposed stranglehold over science. This nonsense has been festering and propagating for decades. Now, due to the pandemic, it has coalesced with anti-vaccination propaganda, and is leading to mobs vandalising vaccination centres and attempting to invade the headquarters of the BBC (but getting the wrong building).
Humanity seems to be suffering some sort of collective psychosis, especially in the richer nations. I just hope it doesn’t turn into fascism like it did in the 1930s.