I was responding to the original post where the question was how to stop the pullets from being picked on. That is a natural behavior and I have never had a young roo hurt a young pullet. The boys try to pick a fight with the girls and the girls just won't play so the fuss is over in seconds.
There was no talk of the pullets being killed at that point in the conversation. Of course I would never leave a mean boy in the flock. They are culled if they get too aggressive with the pullets or humans.
I think you were responding to some of the later posts where people were talking about much more aggressive little roos. I have never had a young roo harm a pullet - maybe because I'm very observant of all of my chicken's behaviors. I have had chickens (and dogs, cats, cattle and horses) my whole life and I'm older than dirt!

I don't want anyone to assume that I don't take excellent care of my animals. I'm not fussing with you, I just wanted to clear the air.