This is completely untrue. Punk is a "thinking man's rebellion against classism?" Since when? Does that describe The Ramones? Or Buzzcocks? Dead Milkmen? Blondie? How would they not be punk rockers? Are The Clash punk, even though Joe Strummer's dad was a diplomat and Mick Jones affected a fake South London accent? Agnostic Front wrote songs that were nationalist, flag-waving, and anti-welfare state; were they not hardcore? A good amount of punk attitude was nihilistic (at least as a pose) and the rebellion was at least as much against the pomposity of the prog and metal in the '70s as it was a social message. I would maintain that punk rock has been one of the most successful musical styles in terms of its evolution and diversity in the past thirty-five years, and one of the main reasons why is that it didn't stagnate as amateurish rabble-rousing, but influenced myriad genres and musicians with the back-to-basics sound and attitude.