I have to disagree with you. If you have a young dog that is barking and lunging at others dogs. And you remove it from what it is reacting to. And stay below the dog's threshold, while you start training the dog, specifically to build the dog's confidence and to build the dog's confidence/trust in you the handler. And you build that relationship, while the dog does some maturing, and work on basic training. And then start pushing the dog's envelope, always telling the dog what to do, rather than waiting for the dog to react and reacting. You can definitely make a lot of progress, and get a very nicely trained dog in the bargain.
We are not talking about a frustration case, we are talking about a fear-based reactivity. By dealing with the dog's lack of confidence both in himself and in the handler, and allowing some level of maturity without constantly bambarding the dog with what is making him fearful, you can reset, and begin again from a different point of reference.
Too many people take a puppy or new dog they do not know very well everywhere, including puppy free-for-alls, dog parks, and doggy daycare and either allow other dogs to bully or all out attack them, or they completely over-react at all the wrong times. A dog that lacks confidence and cannot feel any trust in the person on the other end of the lead, is likely to act out in ways we don't like because sometimes it works and drives people or dogs away, or gets the human to pull the dog out of the situation. If people reset their behavior with the dog, while they are giving their dog a break, and focus mainly on building trust between the dog and the handler, when they move again closer to those things, the dog, being older, being more confident, and having a relationship with the handler will most likely have a lot easier time managing what the world sends his way.
But of course, that requires the humans to take responsibility for the dog's behavior, and it is so much easier for trainers to say, your dog is aggressive or dominant or fearful or whatever way they want to say the dog is flawed, and if we apply this tool or that tool, we can snap him out of this behavior pronto.
And the thing is, it can work. A sharp correction properly timed, CAN eliminate the barking, growling, lunging, stupid behaviors. It does nothing to eliminate the fear behind it though. I think most of the time the dog does not want to fight, they want what they see as a threat to go away. And if pressed up close by a dog running right into it, some of these dogs will not attack. And some will. The snarling, lunging behavior limits the ability for people to completely socialize the dog.
On the other hand, in the process of building a relationship, building trust, dog classes, where other people have their dogs under control are worked in the vacinity of your dog and you, the dog will become desensitized to dogs at a safe distance, and as we continue to manage the dog, train the dog, build the relationship, and manage the environment, the number of good experiences and increased confidence will bring that dog to a different place.
It is not 1 in 10,000. It is a lot of dogs. What it takes is people to accept that they are not perfect and be willing to change. And it takes some time. Again, though, I really do not think it takes that much more time than throwing a correction collar on the dog and applying a correction of whatever sort. Because I see the results of that thinking all the time.