'I am not a dog expert, Cesar Milan doesn't scare dogs'...
That, right there, is a huge part of the problem. People don't understand what they are seeing when it comes to dog behaviour, or awful training methods.
Cesar relies very heavily on using intimidating, confrontational body language, and outright bullying, to force dogs to submit to him.
What you see on tv is the edited footage after several HOURS of working with the dog and Cesar specifically, works with dogs without the owner present for a few hours. They use a stooge dog to wind up the clients dog, and his magical 'tsst' and back-kick with his heel thing... I can reveal that the 'magic' here is several hours of pairing both of those with a harsh jerk of a prong, or super fine 'cheesewire' slip lead up at the most sensitive part of the neck, or a shock collar, until the 'tssst' or the heel kick results in an extreme response from the dog.
This is to ensure it looks like magic on tv and that the dog is absolutely raving with frustration and fear, to get the footage they want of Cesar 'calming' the beast.
But, to know that, you need to have a good education in canine body language, in how they learn, in what the various methods will do and why, and a good number of contacts within the TV production industry, to understand how this works, get first hand accounts of what goes on. (My description of what goes on above is from first hand accounts and behind the scenes video, its not opinion it is fact.)
When you address behaviour like pulling on the lead, lunging at people, growling at people.. by suppressing behaviour by pairing the action with an aversive like a prong correction or a shock or a yank on a slip lead or a kick or yell or whatever... The chances are, the dog pairs this with what they were focused on at the time.
Not on their actual behaviour.
So now they actually feel worse about being near the trigger, but they don't dare express that feeling so the chances are, the owner will now take them near children, believing their dog 'cured'...
And theres where we get these 'he bit out of the blue' and 'he bit without warning' and 'he just turned...' and 'it was totally unprovoked'... cases from.