You've made some very valid points Shadrach, the first is your comment " ...what a rooster does on a daily basis in a fully free range flock.."The majority of poultry keepers on here don't have room for a "fully free range flock" and as Mrs Biscuit says, we can be subject to restrictions about noise and nuisance caused to neighbours which means that keeping a cockerel isn't an option. My neighbours half a mile away across the fields could hear mine crowing but fortunately being farmers, they didn't mind.
The second was about protecting his hens - which was why I was always careful not to get between mine and his hens. However it is possible to get a really bad tempered strain in any animal. I had a beekeeper friend who had to re-queen all his hives because the bees were bad tempered - they would follow anyone who was anywhere in the very large garden looking for an opportunity to sting. I was feeding a friends hens for a couple of days and had been warned to keep an eye on the ram who was in the field. The first three occasions he was happy to let me scratch his head, the fourth time, I scratched his head and he then walked away as before but on this occasion, turned around and charged at me sending me flying, fortunately without any lasting injury.
There have always been "backyard" poultry keepers and we do the best we can for our birds - but some people take a delight in teasing animals and then blaming the animal for the consequent behaviour.