situations they're talking about. In a traffic jam, people can fret, curse, hit the wheel, honk, or exhibit other signs of anger or frustration. But none of it's going to get you to your destination any sooner. It wouldn't even matter if it was an ongoing problem and you spearheaded a successful campaign to resolve the issue. It *still* would've been a waste of energy to sit in traffic and act like the maniacs you see - not only working themselves into a tithy but sometimes also making life hell for passengers.
As to lost luggage, whatever they might do afterwards, at the time, mentally strong people would take care of business: fill out needed paperwork and head to a store to buy some replacement items, making a note that, next time, essentials & a change of clothing should be kept in one's carry-on bag.
As to people, if you think you can change your mother-in-law, good luck!
There *are* some things you can't change. Re lost luggage, no yelling or crying will conjure it up! I think what you said (and I agree) is addressed by a different trait on the list: mentally strong people don't "shy away from change." As noted in the Serenity Prayer: "God grant me the serenity to accept the things I cannot change; courage to change the things I can; and wisdom to know the difference."
When we try to pick out anything by itself, we find it hitched to everything else in the Universe.
~ John Muir