Roosters are no more likely than hens to damage baby chicks, perhaps even less so.
I stand by my recommendation of a safe pen for baby chicks to retreat to for peace and safety from age three weeks old. It's also sometimes referred to as a "panic room". Chicks know they can duck into it very quickly when the pecking order becomes too stressful. They learn how to cope with the adult members of the flock at their own pace, deriving self confidence and independence much earlier than when kept separate and integrated at a much later time.
I stand by my recommendation of a safe pen for baby chicks to retreat to for peace and safety from age three weeks old. It's also sometimes referred to as a "panic room". Chicks know they can duck into it very quickly when the pecking order becomes too stressful. They learn how to cope with the adult members of the flock at their own pace, deriving self confidence and independence much earlier than when kept separate and integrated at a much later time.