Dangerous mind ...

... Knowledge Without Knowledge - Theodore Dalrymple. (Hat tip, Dave Lull.)

His language was clear, but his thought was not. He was what might be called a dialectical equivocator, made dishonest by his early religious vows to Marxism. This made him unable to see or judge things in a common-sense way. His unwavering attachment to his primordial philosophical standpoint, his irrational rationalism, turned him into that most curious (and sometimes dangerous, because intellectually charismatic) figure, the brilliant fool. He was the opposite of Dr Watson who saw but did not observe: he observed, but did not see. He was the archetype of the man, so common among intellectuals, who knows much but understands little.