The moral of the story is to be really mean and inconsiderate of people around you. That plus wishful thinking + Protestant work ethic will make you heroic. That’s the entire point, repeated over and over again throughout the film.

It’s just constant, really obvious repetition of lines like – “I’m torn between that and the loathing of the self-respect I might lose if I don’t do it. I suppose the word is pride. I, uh… I feel that I failed, mentally especially.”

Here’s a dialogue from it –

You really don’t get it, do you? What this is like for us? We’re broke. The time, the emotional toll. I mean, it’s been years, Diana.

Well, suck it up. We’re a team, right?

Wow.

Your superiority complex is really screwed up, you know that?

Yeah. Well, everyone should have a superiority complex. Everyone should feel like the star of their own life.

I’m not even interpreting: it’s explicitly trying to glorify pride and using other people for your ego. That’s the whole gist of the story, more than I can get across in a few quotes.