I'm not sure you actually read my entire post

Because at the end, I conceded that a dog that bit was an entirely different story. Also, had you read the whole thread, you would note that her rescue dog isn't a "bad" dog. Its her original dog that is doing the biting. The rescue dog simply needs some good house training.
Personally, I have tremendous respect for those that choose to do animal rescue. It is an extrememly challenging job. Rescuers, in my experience, don't "lie", but rather tell the truth as they see it. If they see a good dog that seems to be getting along with others, etc, that's what they will report. People are the problem. They forget that these dogs, while family members, are animals. I work as an OR nurse, and we have had kids come in with facial trauma from the family golden retriever. It happens. No matter if its a rescue dog or not. I am not a fan of putting ANY animal down, but if they attack another human, that is another story.
Dogs are animals and they will fight with each other.
What you don't understand is that DOGS don't think your kids are any different than other dogs in the family other than where they are on the dominance totem pole. I disagree with your statement above; dogs fighting each other and dogs attacking humans is a very, very short walk...
The dog that we brought home spent the first day being fine with being at the bottom of the totem pole, which is where he needed to be to fit in with our family. On the second day he went after the cat, who he (correctly) interpreted to be one up on him on the scale. The next day he went after our other dog, who I will add was a certified therapy dog and Canine Good Citizen and would rather chew off her own paw rather than hurt anyone.
So, this was a dog that had no qualms about trying to up himself on the totem pole. He was very submissive around me and my DH, but definitely felt the rest of the family (two and four footed) was fair game and he would wait until he was out of my sight to try and better himself.
My two year old daughter was very obviously next on the totem pole, and there was NO WAY that dog was going to get even the ghost of a chance to try and work his way up any further than he had done already, so buh bye.
Dominance issues are at the heart of many, many dog problems, and dogs who aren't content to stay on their spot on the pole, and people who don't know how to reinforce that spot, are usually the problem.
I'm still bothered by it, all these years later, because I'll never forget the sight of my sweet white dog all covered in her own blood because the rescue dog had torn off half her ear and she needed emergency surgery to stitch it back together.

Most expensive "free" rescue dog ever.

And why did he attack her? Because he felt like she was sleeping in the bed that he wanted-he jumped on her when she was asleep!
Sorry, OP, bad thread spread on me, I get all stressed about rescues...