A brilliant summary--one can be intellectually agile and yet still be stupid.
I often repeat one simple truth (it is not mine but it seems self-evident): intellect without morality is worthless or leads to evil. I think about those things all the time (I am no deep thinker, I never pretended to be), but never the issue of stupidity was so important as it is today, especially looking not just at those public Western "elites" but also those, well known and exposed, allegedly invisible "rulers", who "run" the world. Good God, they are even worse than the drab political edifice they construct for plebs to consume.
Obviously, it is slightly more complex than the mere set of political interactions in the public sphere, but for the explanation of current West's sheer stupidity Bonhoeffer's Theory and George Carlin's monologue will suffice. Same as Mark Twain's genius quip: