Kennedy, the moon landings, Diana, now Covid.
Massive impacts on our lives make us uneasy, so we look for 'explanations' to assuage our anxiety.
And if one doesn't exist, or sounds to 'tame' to be true, someone will make one up, and thanks to that worldwide rumour machine that is the Internet, it will be read by millions, and the law of averages plays, and a large enough proportion of people believe it for it to be circulated again, this time as a 'fact'.
Now we're not so busy having our lives disrupted by Covid, we have the luxury of time to wonder what it was all about.
And so the 'theorists' swing into action.
Anyone can do it, all you need is nothing better to do, a keyboard, an overactive imagination, and a pompous desire to share your ramblings with similarly minded strangers.
Ignore it, you'll feel better.
Make it your New Year's Resolution - no more believing piffle on the Internet from idiots who know nothing of which they speak.