Because the election, for better or worse, was, unbknownst to many of the attendees, a referendum on the very foundations of Western democracy. It was a referendum of fundamental tenets, or, rather, it was just a collosal “fuck you”. There is not a march in the world that can refute “fuck you”. The only possible way forward for them is another fundamental “fuck you.” But, I don’t think they’re capable of that, most of them anyway. Such a fundamental refutation on their part would requre historical wherewithall they have heretofore failed in their demonstration of. On some fundamental level, they refuse to play by the rules that Trumps supporters have reverted to, the real political rules, where anything goes and if you don’t do everthing (and I mean everthing) to stop them then there is no hope. Only a politics of no-holds-barred zero-sum-game is appropriate in this situation and the sooner that the Democrats and their supporters realize that the sooner they can joing the rest of us in the real world.