I'll tell you what. You get a time machine sorted out and I would take you places which would make you change your mind on every part of the above except, "in my experience."
Should you be able to manage a few days in the UK I could show you one rooster now who is nothing like you describe.
Cockerels, particularly a gang of them are a different story.
SHRA
This was my further response to BDutch, after reflecting on the distinction between cockerel and rooster
"Well, I should have specified "cockerels and young roosters are like cavemen" -- and by "that's fine" I should have said "that's fine because it will probably change as they get older." I believe rooster mating gets more civilized and consent-based as they mature. I don't think it's possible to predict how an adult rooster will "turn out" based on his raging hormonal teen years. The prevailing discussion on roosters on BYC seem to conclude that an unruly cockerel is a "bad seed" who will surely grow into an even worse rooster. But again, based on limited experience, this has not been the case here. Nor do I think their behavior is genetically determined, at least not entirely. I'll go against the grain and venture that circumstances are more important.
For example, Lucio, my senior male (now 11 mos old), was a very quiet, non-aggressive, even subservient cockerel until he got to be about 8 months old. The senior hens, especially boss lady Cleo, kept him in check. Then Cleo died and and the other two senior hens, Tina and Patucha, went broody and hatched chicks. Maybe age and hormones were also factors, but I think the absence of matriarchal authority contributed to the more cocky and domineering attitude he developed at 8 months. To my point, now that senior hen Tina has weaned her second brood and is back to being with the flock, Lucio is more humble and so busy attending to her needs, the Food Lady can go about her business without him chasing me or acting ridiculously if I so much get within twenty feet of "his" space.
Numbers also play a role in creating a gang mentality, I believe. The three young cockerels emboldened each other. And they were in competition for only a half dozen hens who were all spoken for. The two I rehomed, Segundo and Solo, both calmed down considerably when they we split up and moved to new places where they got their own hens. Tobias, the cockerel I kept who was the most tranquil of the trio, will chase a hen occasionally, but more often tries to use treats to score a crouch.
I just don't think the way cockerel behaves at 5 months is a true indicator of how he will behave at 5 years. Or even 2 years."
Not helpfull really.
but you're being very helpful to her 
