And many concertmasters promote classical music, people who write books popularizing classical music, people who give out free classical CDs, hold free concerts.
I'm not sure how any of that makes him a better conductor. A great popularizer, yes, but not a better conductor.
Likewise, I'm not sure why Karajan's antipathy to "new music" makes him a villain. I'm concerned with the conducting, and nothing personal. In fact, many people who promote new music have ulterior motives.
Schoenberg, in his writings, converted Mahler’s faith in posterity into a religion of incomprehension and neglect. If a contemporary audience likes you, he said, you’re no good. At the same time, he himself delivered the verdict of posterity by painting Mahler, in a 1912 obituary, as a fragile, otherworldly saviour. That image, for all its obvious distortions, has prevailed in the public imagination. Schoenberg certainly owed Mahler something, because the great man had given him vital public support. At the premiere of the First String Quartet in 1907, Mahler had applauded ostentatiously and nearly got into a fistfight with an anti-Schoenbergian in the audience. Buried in La Grange’s account of this episode is a less attractive explanation for Mahler’s behaviour: appalled by the way Vienna had turned against him, he expressed his contempt for the establishment by applauding these outrageous new sounds. In private he admitted that he no longer understood what Schoenberg was doing. Was that generosity, or hypocrisy?
http://www.lrb.co.uk/v22/n16/alex-ro...iggest-rockets
Bernstein's videos don't make his recordings of Beethoven any better.