It’s not crazy. A lot of things chickens do is inherited behavior, they are also capable of learning and reacting based on experience. When chickens respond to threats it is often heavily inherited behavior, for instance let’s hypothetically say two roosters in your yard get into a tiff, one keeps jumping up and spins... that is a behavior that can be bred for. On the other hand Bob’s rooster only attacks Bob no one else... Bob did something to said rooster that makes his rooster see Bob as a threat... Bob might not even know what he did to his rooster by accident. It really is interesting how the Nature/Nurture thing works in chickens. So you should be able to breed for personality traits you want.