This was a serious mistake, to be sure; but, more importantly, I'm glad no harm came from it. A fact we often fail to recognize (be it from a mother's perspective, or a SM's perspective), is that Scouting is not without risks. I'll say that again, Scouting is not without risks. Two weeks in the backcountry of New Mexico is a not walk in the park. Driving halfway across the country to get there is probably worse. Accidentally becoming separated from the group is also a risk. On any Scouting trip, TDL is an absolute requirement; but, so is the Buddy System. TDL is the adult's responsibility; but, the Buddy System is your sons'.
We can all agree that what happened to your son should not have happened. But, with all due respect, I would encourage you to go to your son and explain to him that he was (and always will be) just as much responsible, if not more so, for looking out for himself. Think of the value of that lesson. You'll find good Troops and bad Troops, good leaders and bad leaders in every Council. Same goes for jobs, companies, supervisors, military officers and presidents, too. I just can't help but think that this would be a good oportunity to turn some lemons into some lemonade.
And don't worry so much about the poor leadership in your Council. For one, they are much farther outside your sphere of influence than you are to your son. And for another, bad leaders move around, come and go; good leaders are literally worshiped.
I have no doubt that, from an adult's perspective, your son's Jamboree experience was a mess, from the word 'go'. But, I'd bet his perspective is much different, far better than ours. Check the news clippings for the '77 NSJ and you'll find that some very misfortunate things happened; but, I would not trade my Jamboree experience, as witnessed through my eyes, as a teenager for that of an adult--not ever.