Because i believe that people feel massively disengaged, Politically. It's as if politics isn't there to be taken seriously. If Starmer became more Populist, vulgar, reactionary etc, then i'm sure that plenty of people would like it. I really believe that it's all about personality, and the ones that act like the biggest Donkey at the party are embraced in the same way an obnoxious pissed up uncle at a Family occasion is tolerated with that lift of the eyebrows and wry grin.