Shadow ministers are right. They have got targets on their backs. But they knew that they were painting those targets when they began defying their leader on Syria and Trident renewal. Which leaves them with a simple choice. They can sit around waiting to be picked off one by one. Or they can produce one final show of defiance: resign collectively and continue the fight from the back benches. Such an action would produce clear red water between Labour’s Corbynite and moderate factions. It would neutralise – if not eradicate – the betrayal narrative. And it would leave Corbyn in sole charge of his destiny. He would finally have to take ownership of each political catastrophe.