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Whatever her actual academic ability or intellect, ideology and personality (not entirely sure those are separate things) can render it useless. Intelligent people can do stupid things because their personality just shuts down their reasoning ability in some contexts - often the practical contexts where it's really important, unfortunately.
In politics, people like that are often underestimated by their opponents, who think they're so obviously complete idiots that it surprises them when the idiot does turn their brain on when career preservation or brutal political manoeuvring is required. Truss failed badly there, mind you.
I was always puzzled by Truss. She must, at least one time, have possessed some academic ability having attended Oxbridge. What on earth did she learn there? Surely one of the key points of a prestigious education is the ability to question alleged 'certainties' whether in personal or public life. I was puzzled and confused by her entire program and repelled by her ideological blinkered determination to persist with practices which commanded no intellectual support or validation. I wonder at the intellectual capacity and tortuous thought processes of someone who views herself (as a Conservative Prime Minister) as a guerrilla ideologist operating behind the rear lines of the establishment! Truly, a modern conservative politician is a strange beast to behold.