Honestly, I don't know what I'd do if my GSDs couldn't be handled by other people. Or if I had to warn people to keep their distance because I was afraid they would bite. I've tried to stack that in my favor, by buying dogs with good temperaments. I'm lucky that I've personally known several of the dogs in my dogs' pedigrees.
I frequently take one of the dogs to Petsmart or Petco to get toys, and I almost always see a kid with their parent nervously staring at us. I always ask them if they want to pet my dog, and they usually say yes. If I have Carly with me, I warn them that she will probably lick them in the face because she absolutely loves
A few years ago, I left with Sage to go get dog food. Carly apparently threw a fit when I left, and opened two gates and was waiting for me in the driveway when I pulled up. I almost had a heart attack when I saw her out (and now we have locks on the gates, so miss houdini can't open them). Two little neighbor kids were out front with her, with a frisbee full of food, trying to catch her. The little girl said "she's very nice, but she won't let us catch her". Then asked me if she was a police dog. Apparently she wasn't intimidated by the "nice police dog".
I recently had Russell, who is a big, confident boy, at the local dog food store to get microchipped. They were running a clinic to raise money for rescue. I filled out the paperwork, and then handed him off to the people to be chipped (I know these people, Russell has never seen them before). They asked me if they could take him in the other room to do it, and then started walking off with him. He turned around to look at me, I told him it's okay, and he just trotted off with them. They were back in two minutes, Russell was all micro-chipped up, and they said "he's such a nice boy". Yes. He is.