David,
I respect your valid opinion, but protection dog trainers are good and bad just as you find good-lawyers and bad-lawyers, good-physicians and bad-physicians, good-police officers and bad-police officers, good-teachers and bad-teachers, good-politicians and bad-politicians, good-martials artists and bad-martial artists, good-mechanics and bad-mechanics, and the list goes on... get the point?
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As far as protection trained dogs is concerned, why do you think the police, military, prison facilities, etc. use them? Because the dog's effectiveness in such service and tasks. Responsible dog owners may want a dog to protect their homes, or business, or an area. And so many people own protection dogs. A well-bred and well-trained dog can be an excellent crime deterrent. Now, if you get your dog trained by an unqualified person, obvioulsy you will end-up with the wrong end-product rather than the desired protection dog.