Duty means that because all of that is immaterial to duty. Duty cares, sure, but duty is buty.
And a fine, constantly upward career culiminating in a nice pension and such is not duty. So duty is scorned, forgotten.
But not quite forgotten -- it subliminates, the psyche's energy meant to be used for duty goes elsewhere. It gets used. Comes out in meanness for some, in callousness for others. Always anger in some way, a slow burning constant hate of the world and everyone in it.
Duty means making choices in the most optimistic heart-felt and diligently considered manner.
Just how is Mr. Fitzgerald's career?
Duty is duty, that is. What a typo!
When a stupid or ill-motivated man, especially in government, does something he knows is wrong, he calls it his duty. As you stated, the definition of "duty" gets prostituted that way.