Bad leadership of the type you describe has shown itself in every country in the World at some point.
the Kamikwasi budget was the end goal of a section of the Tory party who had been planning every single part of it for well over a decade in think tanks, dinner parties and meeting rooms across London and party conferences. Truss told everyone in the party what she was planning to do as part of her campaign for leader. They voted for it because they believed it was the right thing to do for the country. She and her chancellor then went ahead with executing it, and the markets told them to get it in the bin, pronto.
To paint it as a uniquely insane thing to do based on the class system playing out is an odd thing to do to me. It was a political ideology that was planned, plotted, wargamed and ultimately voted for.
It all points to a need for the UK to be rid of the Tories for a generation or two, but I can't see the relationship to a unique and rabid myopic stupidity evident in it that you seem to.