Trained is really lazy short-hand (when I use it), for 'trained, socialised, habituated, mental and physical needs understood and met, housed appropriately, handled responsibily' and thats a 'for life' thing not something you do simply by attending a 6 week course of puppy classes (though if its a good class, they are a good start!)
A major issue is the way 'these people' (who fit the criteria i set out in a much earlier post) live with and handle their dogs.
- Actual training using aversives - thats prong collars, choke collars, shock collars, hitting dogs, yelling at them, pushing them around, causing them to behave or comply due to threats of pain, violence, fear.. This suppresses behaviour but does not address the route cause, causes all sorts of 'fall out', punishments associated with the wrong things, increased frustration, fear, aggression.
- Poor handling generally - walking dogs on tight leads into situations the dog finds frustrating or frightening and constantly jerking the lead, ramping up that frustration or fear, increasing arousal (the case of Beast who killed Jack Lis, this can actually be seen in the cctv footage of the dog. He is repeatedly wound up and taken close to young people he lunges at, he is then yanked at and hit repeatedly.)
- No consideration for stress levels - again such owners tend to lead very chaotic, high stress, frantic lives, and there is no thought to how stressful the dogs find it to have strangers in and out of the house, be left long periods randomly, be shunted from one home or one person to the next, constantly wound up on walks, hit, yelled at, in the company of other scary dogs, in the company of people high or drunk.
- Crap husbandry - poor diet, lack of veterinary care, meaning dogs are poorly nourished, suffer digestive issues, are in pain.
These things are pretty much the recipe for a fearful, unpredictable, frustrated and aggressive dog - chuck in poor breeding with a genetic predisposition towards fear, frustration and aggression (and I have reason to believe the dog who killed Jack Lis fit that criteria too) and that was a death just waiting to happen.
So do the opposite of that - understand your dogs behaviour, meet his needs!
You're not wrong to call their commentary BS - dogs do not pin other dogs in the wild to teach them their place!
Dogs do not care about another dogs status at all, they only care about what resources they can access and who is safe to be around. Dogs that pin other dogs are typically insecure bullies, in the wild they would be shunned by others, they would struggle to survive, they would be at a higher risk of injury, infection and death as a result of this behaviour. Not natural at all, it is maladaptive and a result of poor genetics/poor training/socialisation/management.
Being aware of your surroundings and avoiding situations your dog will not like/will not handle/will stress your dog out is thoughtful and responsible dog ownership.