Not just that, but it trains dogs not to bark or growl when they are antagonized or upset by certain behaviour. Normally a bark or growl would function as a warning, but now he has no other way to go than bite without warning.
Now this animal, who was shocked into never using its vocal cords and antagonized until he bit a human or other animal out of desperation, gets put down because he is a danger to society. Job well done lads!
I've seen these used on rescue dogs that frankly have such complex psychological problems that they cannot be untrained to bark. The only other choice is euthanasia. They aren't so strong that the dog can't growl.
The dog also learns that aggressive responses are not so fantastic.
My own dog doesn't have one of these, mainly because we try to be very careful to manage how we respond to his barking. But if we couldn't keep up the late-night bark management, or if we lose control of the barking, I won't think twice about buying one of these. I've seen them used on other dogs and frankly they work just fine and are humane.
No. Shock collars are exactly how dogs get such complex psychological problems that they're abandoned in the first place.
They're not humane, if you force a shock collar on another human it's legally considered a torture device. If the legal system used them it would be cruel and unusual punishment.
Causing unnecessary pain and suffering is not compatible with being humane. It's as simple as that. There are better solutions with fewer side effects for every use case of a shock collar. If not every single use case, the overwhelming majority of them. (edit: I didn't realize you were the one advocating using shock collars on a rescue dog that barks too much. A shock collar isn't even in the right ballpark in that case.)
Dominance and pain based training methods are outdated and based on debunked theories, in the past three decades almost the entire field of animal behavior has moved on.
Now this animal, who was shocked into never using its vocal cords and antagonized until he bit a human or other animal out of desperation, gets put down because he is a danger to society. Job well done lads!