[pessimizer]

> People with low resilience are going to fail often and early in all stressful situations.

This isn't an argument, though, just a restatement.

> Comparing the same person in different situations is probably not the best metric. Comparing different people across the same / similar situation is probably closer to experimentally valid.

It's not reasonable to assume the same relative value for success in two different people facing the same situation, no matter what criterion you use to choose the people, including if that criterion is what they self-report. Usually experiments like this are done for a token value, guaranteed to be close in absolute value between participants just because those valuations are insignificant. You can't do an experiment that could measure the amount of "courage" and how it drains, or even measure through natural observation without access to internal states that don't have organs called "courage" that we can examine.

What one patriot might call courage in a trench, an otherwise courageous person in that trench may call patriotism. They might run out out of "courage" to stand up to the army overrunning their position and decide to surrender, but never run out of "courage" defending their children.