First off, naming him "Killer" just reeks of class.
Second off, the dog probably isn't aggressive in general, just food aggressive. That lady should've told her son never to bother the dog while he's eating. Poor dog, I hope he's not PTS. It's not his fault he has crappy owners.
But I do agree with this:
"Any kind of dog can end up attacking , whether it's big or small," said Salas.
Yes, any dog can attack. That's why you must teach your children to have common sense around all dogs, large and small, familiar and strange.