Once, when it was Marxist, it saw itself as the guardian and custodian of the laws of history. Now, after history had taken a different turn, it began to see itself as the guardian and custodian of ethics and even aesthetics. From Luigi Pintor’s ‘plebs’ to Stefano Bonaccini. 1994: the horror of those who go to nightclubs and football grounds, and the revolt of the elites