> I would think that a forum full of software engineers could think of other reasons projects go over budget than graft.

We're not talking about projects in the private domain. We're talking about government projects. Look at the Obamacare website boondoggle. Or the recent lack of backups in Baltimore when hit with ransomware. When it's a government project, it's very fair to consider graft and corruption as the primary causes, especially as they often lead to favoring incompetent people in charge of executing the project.