The oath is worse than hollow in practice.
Nobody in the FBI ratted out Comey, or Strzok, or McCabe, and so on.
The principle of the oath is used to "prove" there is no wrongdoing. After all, if there was, it would be ratted out.
An Oath is a construct set apart from any human element. It is a legal edifice.
Yes, oaths can be hollow and ignored. BUT when malfeasance is uncovered and reported, the Oath becomes a pretext for prosecution.
The point is an Oath has a purpose outside of whether a human being adheres to it or not.
If I take an Oath, I am LIABLE if I choose to violate my Oath. I carry LIABILITY should I ignore it. I can be held to account. An Oath violator might get away with violating the Oath for a time, but the liability never escapes them.