Is there evidence that doctors and lawyers are, by virtue of their oaths, codes of conduct, and background study of ethics, more ethical, moral, and upright than members of the general population?

Also, whose ethics would such a Hippocratic Oath advance? For every privacy-conscious person saying that encryption-everywhere is good, there is a law enforcement officer speaking of reduced abilities to solve crimes.

Imagine a software engineer who has been asked to place a backdoor in some software. Is there any piece of uncontroversial advice which you can give them?

And like several previous commenters have asked, could this be a way to shift responsibility from institutions and their management cadre to individual developers?