No, I get you. And I don't mind a little bit of what is commonly called "alert barking". That's the kind where I imagine the dog is saying "Hey! Hey! Somebody's here!" You shush the dog, check things out, determine that all is okay and it's over. That's fine and that alone probably would do a pretty good job of deterring potential thieves. But there is also the kind of barking that sounds more like "Hey! Hey you! Get outta here. I don't like you here, hear me? Grrr, Go away, I mean it!" It's the kind of barking that is meant as a warning. That's the barking I don't want to see encouraged in a pet dog. The odds of the average person ever needing to rely on their dog to protect them from someone are slim in comparison to the number of times their dog is going to need to be friendly, sociable, and tolerant of strangers so I'd rather the dog believe that all people equal good fun and cookies. In the end it's safer for the dog.