Well, I had a whole multi-quote response post planned but alas, as our thread switched pages, I lost my draft quotes, so I'll let that intent go.
Instead, I'll share some lessons learned from this poor family, as I try to let go of the "WHY" question. My thinking here is akin to training programs (e.g. emergency responses) in which you run scenarios to prepare your mind to make good decisions when under high stress - trained to think through options when in crisis.
Purposely, I am not addressing lessons learned about preparing for a hike. But rather, this is intended to prepare for and manage a crisis of a hike when it unfolds.
1. Be constantly vigilant with regards to the welfare, needs and best recourse to protect animal or human dependent(s), as they are the most vulnerable.
2. Speak up and don't be shy to say 'help!' when you or any member of your hiking or traveling party starts to feel at all 'off' (e.g. lightheaded, fatigued, winded.)
3. Stop and evaluate the situation at the first signs of a crisis, while you still have all your faculties, so you can clearly consider options and make decisions.
4. Always be prepared to turn around or change course to seek shelter, rescue, water, etc. at a moment's notice, which will likely mean giving up on your 'goals'.
5. Even if one of your party is uncomfortable with respect to secondary needs (e.g. food), you must always prioritize the most critical needs (e.g. shelter from elements).
6. It is important to be able to let go of social norms if necessary to survive, even if that means sitting in a river overnight until you are rescued during extreme heat.
7. If possible, send the most able of your party on / back alone in order to seek help and rescue, especially when others in the party are more compromised.
8. If one or more of your hiking party becomes gravely incapacitated and others face the same risk, leave the gravely ill behind in order to save the remaining lives.
9. If a member of your hiking party dies while hiking, and others face the same risk, try not to let the profound grief or guilt get in the way of saving your self or others.
10. Assign the most experienced and fit member of the hiking party to be the captain of an outing so there is a single arbiter to make decisions when in a crisis.
Of course all this is easier said than done. Some of these lessons even appear unconscionable to me sitting comfortably at my desk. But I'd like to think in an unfolding crisis like JG/EC faced that Sunday, their experiences and failings have helped prepare me and hopefully others to avoid the same mistakes in order to save lives.