i never had a problem with roosters, only hens will kill chicks is my experience.
roosters are protective but will peck them sometimes to keep them in line
only one has ever attacked me or my family and that stopped real quick. i turned my back and he attacked my son when he was 1, i grabbed him by his head and spun him and slammed it on the ground, and then butchered it(some bones were broken). i have never been challenged since.
oh it was a...
my sumatras get food for the babies and break it into peices for them and make these cluky sounds to get them to eat
game birds are bred to not be aggresive to people only other roosters
i have a kid pool i move around every few days to a week. before it gets nasty
i have them penned when they were babies but they always were nasty now that they are grown they never get penned. i have 7 and its never nasty useing my method