Temperament does seem to pass on. It will pass on a good temperament and a bad one as well. Just look at how it passes on in people, and other animals. When I bred Doberman Pinschers, correct temperament was one of my top priorities! Like I said, unless the bird is exceptional in all other regards, why would you want a flock of nasties? I can immediately tell who sired my chicks, especially the cockerels with my BCMs. The cockerels ALL have the exact same quiet personality of their Dad, and have his unique crow as well. Just going by what I have seen here...I have a hard time believing in the tempermant passing on, is there evidence of a "mean gene"?
I wouldn't let kids get attacked, but without knowing how this attitude started I would set him up with a run and keep him for breeding if he is what you have to work with,,,jmho