Seriously, V, how do you not know this? I mean this is simple logic and facts. Dogs have been bred for certain traits for centuries. It's an established fact.
I understand that. There is a big difference between inherent protection instincts, and aggression. I'm one of those crazy people who just has to weigh my personal experience against the conventional wisdom. I am a GSD guy. I'm getting my fourth, next week. I'll currently have two, the previous two crossed the bridge a couple years ago. All of them are legit, very well bred from East German working lines. These are the dogs you would get if you wanted to train them to do serious protection work. They have all the instincts, and physical attributes required to do some serious damage. I raise them to be friendly, confident dogs who follow my lead. A well bred, well raised dog is not just going to suddenly snap due to it's inherent instincts.
A poorly bred and/or poorly raised dog can be a problem but it is not simply because of the breed. That's the problem with Pits. They are so popular that there is way to much terrible breeding going on. Put that puppy in the hands of someone who doesn't know what they are doing and you can literally create a monster. GSD's got a bad rap in the 70's for the same reason. I would never take on a Pit unless I knew its lineage.
So yes. Breeds have certain inherent instincts. Just like you and me. That doesn't mean every example is a ticking time bomb.
That's been my experience, anyways.