If it was about ideological purity though, nobody would have supported Bernie in the first place, since by global standards he would be considered a moderate and his particular set of policies would probably not do much to fix the fundamental rot in American society. And frankly there's no point in trying to teach the Democrats a lesson, because they will never learn from their mistakes anyway. They keep dreaming of this West Wing type administration where a couple of grand speeches and a commitment to unity and bipartisanship can magically make all the problems disappear, never mind that they nominate the one candidate who clearly isn't capable of doing even that.