I agree with you, to a point. Back in my grooming days, I regularly did grooming for 2 police dogs, and they were great dogs. I never had any concerns about my safety, even though both these dogs had put "perps" in the hospital. They both also lived with kids, and did regular community outreach appearances. They were very highly trained, and that was highly important, obviously They were also BRED specifically for the job. IN GERMANY. Most police departments that still use GSDs (many now use Malinois) don't use American bred dogs, because they have too many issues with health and temperament. Again, I love the breed, but I have also known too many that were not stable dogs and very concerning that they were in the hands of people that did not know what they were doing. They are big and strong enough to do a lot of damage in a very short time, so temperament and proper training are both important, but temperament is more so, IMHO. Case in point, my sister never does any training of her GSDs, and she has had 4 purebreds and 2 mixes, none of whom have ever bitten anyone, because they had good temperament. So they are out there to be found. She has also been told repeatedly by all her vets, that her dogs are the exception to the rule. So, there are bad ones out there too. Just saying, hedge your bet, by going to a conscientious breeder and properly socialize and train. Or, like my sister, get a dog from a reputable rescue that temperament tests, and you can meet the final product and see what you are getting.I have talked to many state troopers as my part of my job and talked to several K9 officers. That dog is trained to be that way on duty. The dog is trained to know when it’s on and off duty. And off duty they are super sweet, playful loyal and protective but not in aggressive manner. But once in a patrol car they know what they’re duty is.