Antisocial behavior with a roo and hens?

[gypsyroseplus6]

We have a roo we have started calling "bully" He attacks the hens all the time. We ended up having to remove him from the flock because he tears the feathers out of the hens. any idea why he does this? (we will be thinning out our roos soon at a auction)

 

[Naser]

I call those roosters delicious