"Our AB brexiteers want " no deal" don't they ?"
I suspect, nearer the truth, is that they would prefer a fair, mutually beneficial deal; but the EU elite has no intention of agreeing one.
I suspect most felt they were likely to try to make things difficult, but fewer thought that folk in such high power positions would be so obstinate and uncaring of the interests of their remaining member states as they turned out to be.
So, being realistic, and seeing the issues with that which Mrs. May came back with, AB "Brexiteers" realise the only remaining option is to give up on the EU negotiations and leave without the deal that's not forthcoming.
It's not the end of the world, trade will still continue. And if the EU continue to be awkward, their influence will reduce over time and become even less relevant.