I think it also ties in with the "olders and betters" mentality that we're brought up with. There's a sense of gravitas to the office of Prime Minister, and even if they're doing stupid shit there's a monkey bit of my brain that's like "ah, but they're old enough to know better than me". But now the PM is only four months older than I am, and my mum worked for his dad for a few years, so we could have (theoretically) turned in the same circles*, and he's up there in the highest office in the land, doing stupid shit and I'm looking at him and wondering who let this idiot kid be in charge.

*We really couldn't have though, he went to a very fancy school and was already married to a billionaire by the time my mum started working for his dad. His dad's actually sound.