It's a classic straw-man, "Well of course a civil engineer says there are civil engineering problems! It's their job on the line!"

You know when a mechanic has a sign out front that says "free brake inspection", how often do you think he says "brakes look great, no work needed"? You should only take advantage of a offer like that if you already suspect something is wrong or in the case of a orthodontist when you think your kid needs braces to begin with.

It's the conflict of interest we're worried about. Not competence to make the assessment.