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When you say "beliefs", what do you mean?
I'm not discounting his advantages, but I'd guess Winchester probably had an entrance exam and minimum Common Entrance grades. It's not like he had a history of family attendance.
Likewise getting in to Oxford isn't easy. Yes the majority have been to private schools but that doesn't mean you get to go just because you went to private school.
Again you don't get either a Fulbright scholarship or into Stanford easily.
Sure once you've built up a CV like that it's a lot easier to get a job at GS. But getting to that point requires consistent academic excellence from a young age and a lot of hard work and focus.
I was thinking a bit about this in the shower.
Sunak is clearly a bright and very capable person. He wouldn't have had the working career he had if he wasn't.
However, he seems to have been most undone by two things, both linked. First, political experience. Second, political ability.
We often bemoan politicians for being too political. But he is a great eg of what happens when you're shit at politics. He several opportunities to isolate Johnson early on, but allowed him to fester and make him look weak at the start of his reign. He's let the right wing nutters maintain a wholly disproportionate hold over the party and block his technocratic new start or whatever his original pitch was.