Maybe you can warn him of the consequences of hitting people in the real world when he grows older. Tell him that he can get arrested by the police and be in a lot of trouble for being aggressive. Let him know that he needs to learn to control his anger because you can't be around to protect him all the time. Seems harsh but I find this "scare tactic" works well because children need to learn that the authorities might not be as forgiving as a parent would.
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