In reading about the Weimar Republic, I encountered an observation (I think it was by Hannah Arendt) that cynicism emerges from a society that no longer believes in itself. In trying to confirm the quote, I found perhaps a better quote to explain (found on Arend't wiki article):

>> ...leaders based their propaganda on the correct psychological assumption that, under such conditions, one could make people believe the most fantastic statements one day, and trust that if the next day they were given irrefutable proof of their falsehood, they would take refuge in cynicism; instead of deserting the leaders who had lied to them, they would protest that they had known all along that the statement was a lie and would admire the leaders for their superior tactical cleverness

This all sounds rather familiar and feels like more a cultural question than one of personal virtue.