I kind of agree with Granberry. My first reaction was "You cruel heartless person, you put your dog down for that?!" But then I thougt about it, and I'm sure Granberry disciplined the dog and thought long and hard making the decision. When a dog has shown aggression to your child, can you trust it again? Also, I highly doubt that an 8-year-old Rottie would have been rehomed in a snap. People don't want old dogs - they want cute little puppies. They don't usually want big breeds like Rotties, they want smaller, easier to manage ones. With no guarantee of another loving home, and no way to know if you can trust the animal with your children, I think it may have been the better decision. I don't think Granberry did it on a whim, to be cruel. He/she did it with a heavy heart in an attempt to do what was best for everyone.
I don't tend to stereotype by breeds (although it does of course inform my behaviour around dogs). I have known labs who have been lovely. My godfather had a black lab that I used to lie on the floor with, with my head on his chest, and he was the sweetest thing ever. Then we looked after a black lab from across the road. We later found out he had bitten the children in that family several times - after we had finished sitting for him. Whilst he was with us, he was in the kitchen watching my mum slice bread. My sister entered the kitchen behind him and stroked him on the head. With no warning, he turned around and bit her very savagely in the stomach. She was 6 years old at the time.
They still didn't put him down, despite his proven aggression. I'd rather they had put him down when he bit their daughter, rather than see him savage my little sister.