Some of his teachings are for the greater good but others tend to be very divisive. Hillary Clinton ( not surprisingly) wrote her thesis on his 1946 book and waited with baited breath for his 1971 primer. No one mentions her love of radicalism now but it certainly explains the disruptive behavior or some of her supporters.
BTW I am not personally a conservative but I am a great proponent of fair play and even those I disagree with deserve respect.