What you have to ask is why are they threatening to walk away from something that doesn't exist?
She never had any intention or ability to formally dissolve our membership. She misused an international treaty.
As far as they are concerned, this is an exit negotiation towards a formal treaty of separation.
What we are not going to do is slide seamlessly from the European Union into the new trade agreement that Theresa May had in mind.
She thinks that if she makes enough silly gestures, eventually a new treaty will appear.
It's all just bluster. She's insubstantial. A fart in the wind. And in the absence of a withdrawal agreement she will resign.
This government is all make belief and pretend. Two fuckin years of it. And what we need now is adults back in the room.