> And yet so many people do exactly what the manifesto tells them not do to. Why? Just why?

The manager on the top says "do Agile" because his friends say that this is now the cool thing. The managers on the bottom have no idea what it means, so they do some random thing and call it "Agile", and report job done. The manager on the top is happy and gives them a small bonus.

And as managers circulate across companies, they keep introducing the "random thing we did at my previous job and called it Agile" as the one true Agile, so the whole randomness converges to one specific version (with Jira and long meetings and other stuff).