This is where I am right now! My accidental rooster has been my pet since he was thought to be a she. The usual story. Super sweet and friendly, more than the rest of the flock. Then she...erm, he crowed. Already deeply in love I decided to change my decision to not have a rooster. All was well till hormones kicked in. It was a bit of a fuss but it didn't last long. I thought I had finally trained him, he didn't even acknowledge my presence, no more attacks. I was new enough to not realize winter would calm him down. Then spring arrived. My sweet boy has turned into a velociraptor! He has drawn blood on both me and my husband. The last time was about a week ago. I haven't been able to visit the run since. I can go in first thing in the morning to open the pop door. He doesn't exit for an hour or 2 after it's been opened do I get to spend a few minutes with my ladies. But while I'm opening the pop door he is trying to attack me through the clean out door.Culling for defects isn’t overly hard. Once you get into culling for behavior it starts to get real difficult.
So here I am now, trying to come to grips with the necessity of culling my beautiful boy. I don't trust giving him away because I don't know they will do proper introductions so he could possibly be killed in a fight. Quarantine could be skipped and he die a horrible sickly death. If I give him away and they follow all good practices they may cull him anyway because of his agression. I understand, he is just trying to protect his ladies from the only thing that enters his domain and isn't a chicken...me. So I am torn between giving him the chance if living by giving him away or culling him myself to be sure it is done properly.
So you are right, culling for behavior is a whole different scenario, so very hard and heartbreaking.