. Kicking a roo seems like you're solving the problem quickly and easily, but all you're doing is making the roo more distrustful of you than he was before. He may keep his distance, but you will never know when he will decide to get the courage to attack you again. Hormones play the biggest role in a young cockerel's behavior. He becomes nervous and naturally distrustful of anyone he sees as a possible threat to the hens. Realizing this, why not take the time to show him he can trust the humans that come to care for the flock?
Training and disciplining a cockerel will produce a rooster, by age two, that is calm and well-behaved. By taking advantage of the time between the ages of six months to two years to correct a cockerel's behavior, you will end up with a rooster with good manners that you can trust. Roosters are very intelligent and will respond to their names and your commands.
It's as simple as moving slowly, deliberately, and disciplining the rooster when he shows any aggressive behavior. Do this by pushing him to the ground and holding him there until he calms down. Later, when he's behaving like a good boy, offer him treats, and yes, you can even cuddle him if he's calm and permits it. Chickens are no different than other trainable animals. You discipline the bad behavior and reward the good. In no time at all, you have a very well-behaved rooster instead of one you have to be afraid of.