There's plenty of incentive for dysfunction on the left too. The Democrats shut down the government because their progressive activists wanted DACA done without having to compromise with Republicans on any other immigration reform. I was flipping through some of Politico's political cartoons, and there's one still calling Schumer and Pelosi wimps and spineless for not keeping the shutdown going. Normal Dems ought to be thanking Schumer for not inflicting any more damage from that stunt than was already caused. He probably knew that was a bad idea from the start.
Of course, Elizabeth Warren, Kristen Gillibrand, Corey Booker, Kamala Harris, etc and any other Dem who voted for the shutdown and to keep it going even after the rest of the Dems came to their senses has that on their record if they're the nominee against Trump in 2020. Those are people who will have no business at all talking about how polarized our politics are and how dysfunctional Washington is, and it's probably likely one of them is the nominee in 2020.