Well, it is sad. Prayers for the family and rescuers themselves.
Hopefully, people will learn from this and be prepared when they go off the beaten path. I've heard people talk about going on long trips and describing it like they were simply driving to the local 7-11 or something. And folks, especially folks who are used to living in big urban areas, have to realize it can be a very, very dangerous world out there.
Never assume the maps are right, especially when driving in Winter. You have to research the route thoroughly, being prepared for any contingencies when driving in that neck of the woods.
It could be that the purpose of one's life is to serve warning to others.
What you say is true, we need, especially on long trips, to be prepared for just about anything.
I am so sorry this story has a bad ending but I can't say I didn't expect this to happen.
Never ever travel in the mountains without extra food, water, clothing, a candle or 2, a blanket, especially from September through May.
A lit candle with one window barely cracked on the downwind side of the vehicle and a blanket can keep you from freezing to death.
One other big point to keep in mind. Keep a inexpensive compass and a map in the glove box when traveling unknown areas whether in a city or in the wilderness.