This is common in many hatchery birds of any breed. I do not have this problem with my birds. I have at least partially raised near 160 cockerels from the strain that I have now, and have not had a single incident.My new hampshire red rooster was by far the worst chicken I have ever had. He would hide behind things when i went outside and attack me. He never bothered my husband at all or the kids just me. I finally gave him to a woman that was looking for a mate for her hen. I did explain to her his temperment. My chickens had a party the day he left. He terrorized the hens and fought constantly with the other roosters.
I bought him from a feed store and he was supposed to be a pullet.. I would never have this breed of chicken again.
Pattyhen