The shut down begins, if Trump does not do anything, such as sign a bad bill. How do you blame someone for something they don't do? The House will have done something, which is write a bill, they consciously know the President will not sign. It adds up to the Democrats doing this since they consciously did something, that makes causes a problem.
The analogy is Joes load the gun and give it to John to fire. John does not fire the gun. Later the gun goes off and injures someone. Is John responsible for not firing the gun. Or is Joes responsible for loading the gun?
Trump manned up the first time, and took the heat, for doing nothing. This time, the ones who loads the gun, knowing it will go off, will have to take the heat. Fake news can try to spin this, but the wall only cost less than 0.15% of the budget. This is small compared to the arty that is willing to tax at 70%. They will have loaded the gun in away that it will be designed to go off; sabotage. The America people will see this.