Historical point taken. Nonetheless, I find it hard to believe that this was Brezhnev's intention, stated or otherwise. And I don't recall Marxists or the left opposing US counter-intervention with the hope of thwarting such lunatic hill tribesmen, as you call them. In fact, to the degree that such tribesmen are the predecessors of the Taliban, Al-Queda and the noble resistance in Iraq, Marxists might have decidedly mixed feelings about them, especially in hindsight.
Christian