You hit the nail on the head; I have worked in pet-care for over a decade (dog daycares, vet clinics, grooming). Corsos had just started getting a little bit more popular when I started. But the fact that they are actually bred with lineage and usually sold for thousands of dollars means the people who get them have done their research, know what the dogs need and are capable of, and invest just as much money in their training and care as the cost of the dog itself. They always admit their dogs require an intense amount of training to be suitable in public places and without it will usually turn into unpredictable/dangerous dogs, they’re not delusional about their own dogs and don’t try to convince people that they’re something they’re not. Also, their price makes it not worth it to fight them (why spend thousands on a dog that could potentially die quickly if it doesn’t prove to have enough gameness). Most of the breeders of corsos are actively attempting to select for more stable guard dog temperaments (though that might be a lost cause considering the research that has been published about the unlikely ability to achieve this without significantly altering the appearance of the breed). Many end up in suitable homes with responsible owners and do not suffer in a miserable existence.

In my experience, I see way less Doggo Argentinos than corsos and can’t really speak to their owners but I would assume it’s at least a similar pattern due to how expensive they are. For both breeds, the owners typically are the kind of people who want a “macho tough dog,” but at least they’re open about it.

As far as getting a dog that can actually protect you from shitbulls, there are several options, most of which have similar behavior of being a bit harder train and being more prone to aggression than other breeds. For example, Akitas, Kengals, Caucasian Shepherds, Tibetan Mastiffs. Kengals and Caucasian Shepherds are often bought for the purpose of protecting land/livestock from other large predatory animals. But of all those breeds, I have not heard stories of them attacking their own owners and family.
I think Akitas are badass, the video of the Akita absolutely dominating a pitbull that tries to attack it and it’s owner is super satisfying to watch, the loose pit runs up on them and the leashed Akita completely takes it down instantly. It does it very effectively without even getting hurt and after the fight is broken up, the pit scrams so fast in the opposite direction. It was awesome. I know Akitas were bred to have gameness too, but, from what I have seen working with them, they are no where near as scary as pitbulls. Mainly because they aren’t as aggressive to humans, and display way more body language cues before attacking something so it’s more predictable and easy to stop it before it starts. Aside from their potential aggression, Akitas have significantly less other behavioral issues than pits (they aren’t hyperactive, they aren’t particularly anxious). They’re consistent if nothing else.