@Ridgerunner -- I found your information on the roo to hen ratio really interesting. I had always taken it as gospel the you need at least 8 or 10 hens for every roo. Did some of the roosters not mate at all? Or were the hens able to handle their attentions.
I absolutely agree on the space comment by Mrs. K. The more room you have the fewer behavioral problems you will have.
I don't believe in magic numbers. From what I've seen there is nothing magic about them. A 10 to 1 ration does not stop roosters or cockerels from fighting, it does not prevent bare backs, if does not stop pullets from being harassed. It does not guarantee good fertility and more than going over the 10 to 1 assures poor fertility.
One regular on here free ranges a lot of chickens, allowing them to sort themselves out as he seriously tackles predator issues. He says when given a choice the typical flock is one rooster with 7 hens. Some are larger, some smaller, but the average they select is seven hens per rooster, not ten.
My normal main laying/breeding flock is 6 to 8 mature hens and one mature rooster. During the hatching/raising season I may have over 50 chickens of various ages in the flock at one time. One time several years back I had three roosters and 15 hens, totally free ranging. I did not have any problems at 5 to 1.
One huge difference is that we are mostly talking about roosters and hens, not cockerels and pullets. When they mature they really settle down. The roosters have gotten past that hormonal stage where they have no control. The hens have matured to the point that they will accept a mature rooster instead of running away or fighting. You can always have exceptions but flocks consisting of mature chickens are typically pretty calm.
But we are talking about cockerels and pullets, not mature chickens. They typically are not going to be calm. The cockerels hormones are raging, the pullets are not mature so don't want to accept the attention of the cockerels. The cockerels can be pretty obnoxious anyway. It is not going to be soothing or pleasant to watch. As long as no one is hurt, I consider it being chickens learning how to be chickens. I've eaten pullets and hens before due to behavioral issues. It's not just the cockerels or roosters.