Thank you, mom and dad, friends, sorry for the pain and hurt that you are experiencing.
One thing I know is your child is under stress, extreme stress by themselves or adults unintentionally. We need to understand them.
Stress season of US is highest in January: with the soaring of death, and cardiovascular stroke. Maybe they are too stress because enjoying time passed, boring stressful work begin and stressful paying credit cards for the amount that overspend before Holiday, New Year'Eve, and black Fridays. School also make American stress. The number of death reduced substantially during summer vacation, and the number of injury for kids is increased, maybe the kids play more freely than other time.
One thing to check about the effect of schooling in society: look at the diagram of the death rate between America and Europe with Australia and New Zealand. The pattern is so obviously opposite according to the different school schedule and summer vacation.
Best of all
Embrace him with love, connection, free stress environment, and chances of joy, happiness to build his abilities. Stress dominates him that he is out of control.
Think of meditation. All of these will soothe the overactive or stressed mind. Think of the moment you are under extreme stress, you may react like him, you may hurt other unconsciously.