As a project management professional, I have to wonder why these project so-often fail to meet their objectives of cost, scope, and schedule? It makes you think

As a project management professional, I have to wonder why these project so-often fail to meet their objectives of cost, scope, and schedule? It makes you think that there have been so few of these projects, in the past 40 years, that any "lessons learned" from former projects are unavailable. Plus, the duration of such projects probably causes loss of knowledge via retirement of the smart people. If you want to make these projects work, I would recommend spending much more time on planning and give project control to the project managers. My guess is, that since this was a "state owned project", they took a typical "state run" mindset, which always displaces the liability of incompetence and failure onto the endless bank account of the taxpayer.