Rolling Stone has been in business for 50 years — its first issue was dated November 9, 1967 — and it has been disappointing radicals for at least 49 of these years. Its co-founder Jann Wenner’s approach to revolution was to un-foment it: He advised readers to steer clear of the fervor of Chicago 1968. In 1970, as the radicals began to figure out that the magazine, freshly bailed out by record corporations, was actually a sales brochure for rock dressed up as a counterculture Bible, a graffito reading “Smash ‘hip’ capitalism” appeared next to the entrance of Rolling Stone’s …