Clearly that is your opinion on this man who is a certified dog trainer but100% false, if you need to have special training to own a dog of a specific breed and avoid it killing people, its not an owner problem its a breed problem. I MIGHT support people owning dangerous breeds IF there was some kind of certification/training required AND they had to maintain additional insurance in case something bad happens. The easier and safer solution is just to restrict ownership of these dogs however. The owners in the video arent BAD, they are just ignorant and have the wrong species of dog, because some IDIOT told them there are no bad dogs, only bad owners...
Now I agree I don't think it's a bad Idea that everyone who owns an aggressive dog breed receive special training or Ban all aggressive dogs because some people are just to stupid to own a dog with a high level of intelligence.
If people would take away the emotional aspect of this discussion one would clearly see that 95 percent of all dog attacks are a direct link to bad owners but personal opinions based on emotional experience will effect one's ability to see that.