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About right to me.
Good examples: some production bred lines of RIR roosters are notorious for being very aggressive and "coming back at you" no matter how they are handled. It's because they were bred for production, temperament of the roos is not that much of a factor.. so the aggression gets carried along in the breeding OR it happens that maybe for some lines, high production comes in hand with aggression in roosters. "Manfighters" in cockfighting stock are considered undesirable, and are often culled out so many of their birds actually are tame/friendly with people, but still have total urge to kill each other. No training needed.
Personally I think the "problem" here are the low to mid range aggression roosters. The same rooster handled or raised in different situations could turn out aggressive if raised super tame- it has no fear at all of people. Yet this same rooster if raised by hens and not tamed, might never attack people. So you have people advising not to raise cockerels super tame, others don't see it happening with theirs, etc.
OR.. if they do attack people, some of them will be 'mild' enough to be deterred for good by various techniques. I don't think the technique itself matters very much as long as the reaction is immediate and not what the rooster instinctually expects. Being kicked across the yard, getting hosed, picked up and petted, picked up and carried around by the feet probably all in theory work on those low-mid range roos, as in it "messes" with the rooster's instinct programming for a fight. Some roos will never again try after just one or two of those treatments.. but mid to high have the chance of eventually getting worked up to try again or instead set target on someone else. Those roosters that attack again after two or three treatments seem to have a high chance of being repeat attackers, with months in between. With those sorts, it REALLY is not worth keeping if there are small children or for someone who prefers a rooster not attack at all.
Bottom line... mistake to think aggression is either/or and that all roosters are the same. Some will be 'curable', some really will not be curable, short of the stew pot.