On Political Reality
I am seeing a lot of headlines today like "Furious Progressives Slam Democrats For Caving On Shutdown." When Republicans were in the minority, their partisans used to accuse the R's of the same failure / weakness. The reality is that there is only a limited amount that the minority party can do. Democrats back in the day were unwilling to allow Ted Cruz to derail Obama's signature issue (health care reform) and Republicans seem unlikely to allow Democrats to do derail their plans on Trump's signature issue of immigration (as much as I would like to see those plans derailed). I think reasonable people would like a system where the majority party sets most of the agenda but the minority party does not get completely shut out. That is basically where we are, though you can argue over the balance.
I will ask the Left to remember that effectively it was they that established the precedent in people's minds that having the minority party shutting down the government over issues tangential to the budget itself was tantamount to the apocalypse. Having established this precedent, Democrats have to live with it now that the shoe is on the other foot. I also, by the way, seem to remember Progressives just a few years ago arguing that Congressional gridlock over issues like this was sufficient justification for the President to more forcefully exercise Executive power. Pretty sure no one on the Left is arguing that today.