The difference between the fire fighter and the fire safety inspector. The former puts out fires and saves lives and is of course a hero. The latter complains about things that never happen, wastes everybody's time and money and is generally annoying.
In my engineering job of over 30 years, I've noticed that the heroes that get rewarded for fixing the problems are usually the same ones who created the problems in the first place.
I've only been a paid-on-call firefighter for 10 years, but I have yet to work with any who are also arsonists. ;)
It seems like the safety inspector might be closer to a SOX compliance auditor or something... in this metaphor, the engineer who doesn't build something that "catches fire" is just the one who uses sensible materials, includes smoke alarms in the design, and chooses to use passive insulation in the walls instead of electric space heaters on a high-pile rug.