You can't get behind a Governement who does not know what they want, and are totally divided on how to go forwards. You can't get behind a Government fightint the best deal that does not exist - and when no deal can never be as good as the deal we have now. If you truly feel, backed with evidence from many sides, that what your Governement is doing will be massively damaging for the country-you have to do everything you can to stop it. Even and more importantly, when it is clear that the the poorest in society who were lied to hugely to push them to vote for what will literally make them even much worse off- then you have to fight.