I understand the direction of your comment, engineering doesn't guarantee security either.

Hubris is the single biggest downfall, whether it's pegged on insecurity, or a false sense of knowledge, superiority or entitlement.

The very best and most experienced people I know have deep expertise, and maintain a healthy mistrust of their own work to keep an eye on it and improving it.

Real world experience and run history is a big thing, and people can re-learn the lessons of the past over and over with their egos, or also be open to learning from others to learn quicker.

It's not hubris (for the engineer) in this case though. It is the fact that company X knows that its dept Y can thrive with 10 engineers, and stay afloat with 5 engineers, so the magic number is 5. And then it is down to the individual to convince their manager (or resign) that problem_A is bad, but problem_B is worse, but not in my P&D objectives.

  The hubris comes from the fact that the CEO doesn't hear the problems that Directors don't disclose.
  The hubris comes from the fact that the Directors don't hear the problems that Senior Managers don't disclose.
  The hubris comes from the fact that the Senior Managers don't hear the problems that Managers don't disclose.
  And Managers simply don't care to hear the problems that Engineers face because "shuddup and close that Jira ticket within 48 hour or else".

(definitions)

The terms hubris, ate, nemesis, and tisis originated in ancient Greece and had specific meanings and roles in everyday life.

  Hubris
  “Hubris” was a fundamental concept in the lives of the ancient Greeks and was used to describe someone who overestimated their abilities and behaved in an arrogant and offensive manner toward others, toward the laws of the state, but above all toward the gods.
  According to ancient beliefs, such acts of hubris offended and enraged the gods.

  Ate
  “Hubris” consequently provoked the intervention of the gods, and especially Zeus, who sent “ate”—that is, a clouding or blinding of the mind—upon the hubristic person.

  Nemesis
  “Ate” led the hubristic person to commit further acts of hubris, until they committed a grave folly or fell into a very serious error, which provoked “nemesis”—that is, the wrath and vengeance of the gods.

  Tisis
  Next comes “tisis,” that is, the punishment and ruin or destruction of the person who committed hubris.