The point GP is making that civil engineers will not (knowingly) design an unsafe product just because they got something in a specification that led them to do so. They’ll object and refuse.

You were arguing that the specs or decisions made above their pay grade forced the software engineers into a dangerously faulty design which they dutifully created and shipped.

It's a bit circular, though, isn't it? It is in part due to the fact that a mechanical engineer _has_ that legal certification that they have the standing to meaningfully object, and actually be listened to by their PHB.