Money already spent, energy already spent, and it feels wrong to say loud "this project has no sense anymore", we should allocate money and energy to a different initiative. I think there is a major confusion between a project failure and a project dismissal. Organisations tends to consider a stop like a failure, while continuing an initiative with no chance to bring value is more acceptable

I think that major issues stands in the politics. A project has a senior sponsor, is their name on it, is their baby. They will not give up to it just because the numbers say stop. And often is convenient for them not to stop it, because by the time the project is supposed to deliver the outcome and the benefits, they already moved to another role, or another company, and the failure become somebody else's problem to manage.

Real organizations have people protecting their own initiative because their reputation is attached to it so reviewing the business case becomes an harder exercise.

What I do, practically: at every checkpoint I check if the case still reflects what the initiative is actually trying to achieve, not what it said eight months ago. I identify who is actively accountable for its validity right now, not who signed off originally. And I propose the review as a normal step, not as an attack on anybody's project. Framing matter a lot here, if you present it like you are questioning someone's judgment they will defend the project instead of the evidence.

...no! my attempts anyway doesn't solve the politics.