The Prime Minister did notionally consult the Cabinet before pressing the Go button on YouTube. What is scary is that he could have been so utterly confident that no objection could conceivably arise from his senior colleagues.
They must have known - surely they must? - that this idea needed... how shall we say..? a little more work. It was nuts. It was preposterous. It was self-evidently silly. Who in Cabinet thought so? Who spoke up? Who supported them? Did nobody stick to their guns?
And how did it possibly come about that when Mr Brown said or implied “Right. Agreed then”, and made as if to move on, there was none brave enough to give a little cough: “Ahem... I think if you ask around the table, Prime Minister, you'll find a sense of shared doubt about this.”
To help him decide which of his ideas were runners and which not, Tony Blair was emotionally confident enough to invite colleagues to kick him as hard as they could in private debate. Why will nobody do this for Mr Brown?
This week's other Brown debacle, the Gurkha affair, is both different, and the same. I do see how a decision of a fairly specialised kind might not have looked as duff on paper as it did to the backdrop of Joanna Lumley waving her arms around in the sunshine, flanked by bemedalled old soldiers. There were two clear lead departments, and other Cabinet Ministers wouldn't normally wade in. The fault here lay in a failure of contact between the Prime Minister and developing opinion farther down the ranks of his own parliamentary party. This vote hit him out of the blue.
But why had nobody told him? Had he blocked his ears? Were close colleagues afraid to give him bad news? Do these people not talk to each other any more?
One begins to wonder whether any serious discussion at all now goes on at Cabinet level. How surreal this week that it should be at senior levels in the Conservative Party (“the Conservative Party”, Neil Kinnock might have intoned) that an overdue discussion began on whether an expensive new generation of nuclear weaponry is affordable; while a Labour Cabinet is now so sclerotic that this kind of open debate can't happen...
...Here, then, is one good reason why Mr Brown deserves to keep his job. Because were he to relinquish it, it would be to someone who had known his leader's incapacity, seen it often and at first hand in Cabinet, yet never spoke. And that's worse than talentless. It's gutless.
To oblivion, then, with the whole damn lot.
So if Gordon is at some stage toppled, let's just ask Alan Johnson or Jack Straw one question. Why did you remain silent?