> “Never attribute to malice that which is adequately explained by stupidity.”

This is not an argument, it's just a stupid quip. And I would sooner suggest that you "never attribute to stupidity that which is adequately explained by malice". Humans are overwhelmingly selfish and more than willing to harm others to serve themselves.

Given the amount of malice in the world, that's not even an unreasonable statement. Even more so if you agree that being in a position of power while not having the expertise needed to fulfil it is itself malicious.

The traditional quip works well on small-scale stuff, but if there's loads of money or power to be gained, malice and greed tends to be fairly prevalent.