So many things to respond to...
1. I used to take my coydog hiking in the Adirondak "High Peaks" area off leash all the time. Depending upon the dog, the rules, and the area, I see nothing wrong with it on principal. We were in very remote areas.
2. As I stated in my first post, I don't see anything inherently wrong with intentionally and dispassionately administered physical corrections. That's how pups learn from their canine parents. I see a LOT wrong with smacking a dog, shocking a dog, or worse, because you're angry. My biggest beef with shock collars is that I don't see how a dog can know WHY and WHO is shocking them. Yes, dogs are capable of that level of thought, and a lot more. I have ZERO doubt about that. They possess an intelligence (OK.. varies from breed to breed and dog to dog a great deal.. we had a very docile, relatively unintelligent GSD, an incredibly sweet, friendly-to-all-creatures-human-and-otherwise GSD of average GSD intelligence, and a relative genius GSD that strangers would definitely not have enjoyed without our OK) far beyond basic stimuli-response learning.
3. I am still, personally, very conflicted about certain breeds, especially as I am an admitted HUGE fan and rescuer of so many GSDs, which can of course be deadly. Still, they weren't bread to be fighters; they were bred to be intelligent, protective, loyal working dogs, and that they definitely are. Pit bulls, meaning Staffordshire Terriers and the newer American Bully primarily, were bred solely as unbeatable and tenacious fighters, period. They're bred to latch on and not let go until their foe is still. They have incredibly powerful jaws. YES, they can be very sweet dogs (as can all dog breeds), and one of my sons has one.. a very nice dog. Caucasion Ovcharka... another incredibly powerful (and much larger breed)... gorgeous dog... but with the same easily fatal capabilities. Yes, every dog can be a wonderful dog... but why not choose a dog without the capability to kill someone easily, if one has a choice? I guess that's the part I don't get. AND.. Yes, I'm a hypocrite. Any of my shepherds could have dispatched an intruder.. and our smallest, most recent one may actually have done so if we weren't present. Even our current Bernese Dog Mountain would be difficult to defend against if he felt threatened. As I said... I'm conflicted. I love, and I mean LOVE, big dogs. They have a soul, presence, and bond with their humans that, somehow, just can't be equaled by smaller breeds. Of course, the scarily almost-human intelligence (I put him at least on par with most three-year-old humans, maybe four-year-olds) of our Kelpie makes for a completely different type of bond/relationship, no less awe-inspiring (and even more, in many ways... just different).
4. This thread started out with lots of folks reaffirming my innate aversion to shock collars, which to be honest kind of surprised me. I expected some trainers, or folks who'd hired trainers, who used the collars to put me down almost immediately for being uninformed, and touting the value of the devices, safety, and benefits. Some folks did eventually chime in in favor of the devices, and I am still open to the possibility that they can be used effectively, humanely, and constructively.
5. The first thing I did when we brought home the shock collar was strap it to my bicep and administer the "correction" to myself. The previous owner had it set on "50"out of 100.. for a 28 pound dog. It was INCREDIBLY painful to this 150 pound human. It went into a kitchen drawer, immediately, never to be seen again until I started this thread over two years later. Still hasn't been used on the dog.
6. It won't be used on the dog. The collar is too small, and won't fit around his adult neck. Decision avoided.
7. We HAVE been doing even more structured walks and training the past day or two. Will update occasionally. If anyone sees Fred roaming about in the NE US, please return him to me...

He's chipped, has good tags on, and in all seriousness... I will continue to keep him safely tethered until such time as he increasingly earns his freedom.
Thanks to everyone for all the discussion.