The backstabbing, etc., of Corbyn was predicated on a pack of lies about him. Criticism of Starmer (call it backstabbing if you must) is far more to do with his lack of charisma and inability to oppose the policies of the Tories. He's behind the curve at every juncture. The Tories have done so many disastrously wrong things, and killed tens of thousands of people thereby, in the last fifteen months, yet you'd still hardly think that we have an opposition at all. It isn't backstabbing to express frustration at this. A good, alert, aggressive Labour leader would have made mincemeat of Johnson months ago. I seriously want Starmer to do well, and wanting to give him a good kick up the 'arris, and saying it out loud, is not undermining him in my view. Shutting up about it and thereby permitting a cosy, complacent bunch of establishment New Labour-manqué middle-of-the-roaders to rule the roost is no way forward and will simply give Johnson a free pass next time around.