I have to ask you why anyone would breed non agressive roosters if not for profit and making them easier to turn into pets?
Roosters are supposed to be aggressive.
You think roosters are supposed to be aggressive?
I think roosters are supposed to mate with hens so the eggs are fertile and can produce chicks.
That is the ONLY thing a rooster is really needed for.
For protection, someone can build a safe pen, can use a properly trained dog, or the person can stay with the chickens to protect them.
For the sound of crowing, someone could listen to a recording.
For a pet, someone can use a hen or a capon (or a dog or cat or any other domestic animal.)
But there is no other way to get eggs that will hatch.
So as long as a rooster is still able to mate and fertilize eggs, I don't care what other traits people want to breed for (exception: I don't like traits that are harmful to the animal itself, like being too heavy to walk or having such a big crest it cannot see properly.) But I do not think lack of aggression harms the rooster or his hens.
Even large roosters are unlikely to do you any lasting damage when they attack if you wear appropriate clothing and consider carefully if what you do is likely to ellict an aggressive response.
I agree that the rooster is unlkely to do major damage in those circumstances, although I am not willing to deal with a rooster that regularly tries to harm me either. I like to eat chicken, so I will always choose to eat chickens that cause trouble before I eat chickens that do not cause trouble for me.
Breeding any creature for attributes that are mmeant to please humans but in the long term damage the species is just wrong. I don't know how to put it in another way.
All breeding of domesticated animals is for the purpose of pleasing humans. And if you are measuring them against the wild species, the domestic ones will always seem damaged. I'm not sure how far you meant it to be taken, but that view could lead to not having domestic animals at all.