This is precisely the reason I advocate separating all overly aggressive/attentive cockerels for at least their first year. Cockerels are at least as likely to have their brutal tendencies mitigated over time as not, and keeping them away from the pullets and hens does no harm to any of the flock or to the cockerels.
This year, I wound up with three unwanted cockerels due to very inept sexing by the hatchery when handling my orders. The first two cockerels were quite opposite in temperament. One was as our OP describes the hoodlum pictured above, having a mating style that resembled an armed and fired missile. The other cockerel was so smooth in his mating style, wax on, wax off, hardly anyone, including me, was aware he was even doing it, even when it was going on right next to me. The hens mostly all love him. Needless to say, I've found no reason to separate the second one from the flock. The first one was let outside to free-range first thing each day, and only let back in to roost with the flock at night, and he even found a way to cause a commotion at roosting time, too. I managed to find a home for him with a flock without any other roosters.
I now have a third cockerel who will be coming into his hormones in another month or so. He's the same breed as the first cockerel and thankfully he has a home with twenty hens lined up to go to when he reaches maturity. But if I had to keep him, under no circumstances would I permit him access to the hens during his first year if he demonstrated the same tendencies has that first one did.
Some may question my sending such a cockerel to another flock. Quite often, going into a new flock will mitigate the temperament of a hoodlum. This is exactly what has occurred. The reports I have been getting are that this cockerel has adjusted very well to his new flock and everyone is getting along splendidly. Re-homing is a perfectly acceptable option to culling, and so is segregation.
