It creates chaos and forces concessions that look like compromise. Give up nothing and always take at least something. It's a long game and it's been going on for a long time and their isn't much left to give.

because to them its a bargaining chip.

If Dems don't cave and give them what they want, then people wont get their social security checks, Children wont get fed, etc etc.

Because they see the most vulnerable americans as worthless tokens to hold hostage.

A significant portion of the majority says "don't."

"I'm sorry, if you're not wearing a tie at this moment then we shouldn't really be talking about the government shutdown" --real quote from politician, probably