Never attribute to malice that which is adequately explained by stupidity.
Hanlon’s Razor

This, I realise, is virtually the motto of Lockdown Sceptics and one of the reasons I’m sceptical about conspiracy theories.
Toby Young

This presupposes that stupid people aren't capable of forming conspiracies.

Some are obviously capable of taking what is intended to be a joke (e.g., Hanlon's Razor) seriously.
Bloch, Arthur. 1980. Murphy's Law Book Two: More Reasons Why Things Go Wrong!. Price Stern Sloan. p. 52. ISBN 9780417064505.

There are levels of stupidity - ignorance, folly, mistaken actions, whatever you like to call it. Those who are ignorant do not recognise the harm to themselves by harbouring malice. That is stupid. When presented with two plausible alternatives, only a stupid person would adopt the most unpalatable - particularly when that view motivates actions that prolong, or exacerbate, the situation.
There may well be conspiracies out there. If there are, the most effective way to stop them in the long term is to undermine them by changing the minds of the conspirators. Other actions are short term only. They have their place, but should be seen in the wider context.