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