[samus]

You are comparing apples and oranges here. Bridge building should be compared to aerospace software engineering, not to the average CRUD app.

Apart from that, I think you are giving too much credit to construction engineering outside of the highly regulated sectors. They mess up just as often, and expensively so. But stakeholders in construction are slighly more aware that their requirements are going to be set in stone, pun fully intended.

What really makes a difference is the malleability of software. This is an invitation for feature creep and last-minute changes. Also, the impact of overengineered, unmaintainable software is not quite in-ya-face as for physical assets. Therefore, in software engineerin project managers need to be religious about these matters. And software engineers must get better at communicating about these concerns.