We never had an issue, but we had a big lot and the coop was big enough to live in.Yard birds are not very social around each other and are very brutal. Cooped up they will kill each other and the wounds can become infected spreading disease
If they free range they have eggs every where and it literally is like hunting Easter eggs everyvday
So they have to be cooped up and minded ( maybe reminded). not to kill each other
We had one Ornery Dominecker rooster once, he made great dumplings.