As @sjwrenlewis concludes, because the Right spends most of its time lying to the voting public, the UK's political environment has become more 'dumb':
'When key political actors are constantly lying and getting away with it, it becomes harder for the rest to tell difficult truths, or indeed to hold any kind of serious political conversation. When one side is telling voters they can always eat cake, it becomes hard to say that cake is off the menu'!
https://mainlymacro.blogspot.com/2026/05/why-has-westminster-politics-become-so.html