This has been a very interesting thread to read. I had missed it, and then because of the reference on db's "wilderness" thread, I was directed over here this morning.
We all hope and pray that we won't have an accident/injury on a trip and need evacuation. And I think most of us are woefully unprepared for that possibility--I know WE are and we have been going to the BWCA (even the Q back a couple of decades ago) since 1971! In our case we have advancing age to deal with and a myriad of physical limitations as well, so we are what you might consider "high-risk". And we still go, and we still take chances. That could be considered foolish; I know some of our family and friends would say so.
And I do think a church group (or a scout group or any group that is taking kids/teenagers) has a responsibility to be well-versed in first aid procedures and knowledgeable about appropriate clothing and gear.
Rain gear is an absolute must, obviously!
Having said that, however:
Many people never use an outfitter. We have never used an outfitter in 38 years of canoe-tripping except for renting one aluminum canoe and a couple of packs for our very first trip! That first trip was a nightmare by today's standards--we didn't any of the "stuff" that everyone considers necessities "nowadays" (egads--I sound like an old lady, don't I?)--we had a canvas tent, cotton flannel sleeping bags we borrowed from a friend, blow-up air mattresses like you used in a swimming pool that held air until about the third day, jeans and cotton sweatshirts, ponchos, and our duffle was an old army duffle bag. No stove, no sunscreen, no headlamp, no nalgene, no water filter.
The only holdouts from those days--we still use our old Duluth pack purchased used from Canadian Waters in 1971, and Neil still trips in tennis shoes!

I am glad for my Gore-tex rain gear, my hiking boots, my SeaLine dry bags, and my Katadyn filter. I don't wear jeans anymore and wouldn't give up my sleeping pad and bag for the "old days".
But I think it might be unreasonable to assume that everyone uses an outfitter, or that everyone needs to have the same gear that we all consider necessary in order to do a wilderness trip.
People have to take responsibility for their own decisions and live with the consequences. Harsh as that sounds, if it is even a stab at "wilderness", that is the bottom line. I pray if I ever have to deal with a serious crisis that I have someone like marlin55388 around, but the liklihood of that happening is remote, isn't it?
They were fortunate, indeed. Hopefully they learned from the experience. That is all any of us can hope for.