"It will have to be arrived at by negotiation, with EU justifying every item."

There are two sides in this negotiation, and it's incumbent on both of them to reach agreement, so BOTH sides have to reach compromise. By going into the negotiation with one or other saying their opposite has to justify everything, this could take forever and comes across as belligerence.

We are leaving them, not the other way around so the onus is on us to make sure we reach a compromise, not least for the good of the people of these islands. The alternative, a hard "fuck 'em all" brexit would be the worst possible outcome, as it is there will be no winners in this lunacy, but at least our idiot Tory Brexit team should be acting like statesmen and not petulant children. For all our sakes.