Iam Isolation where there is no-one to be hurt by his tantrums, yes. He can't be completely isolated for the next 4 years, though.
What if his isolation is impossible in practice to achieve, as he must continue to be surrounded by his playmates, some of whom are copying his behaviour, and others are getting injured by the way he uses his toys as weapons to hit them with ?
He can interact with other children in the neighbourhood too, and them with him. What if another child with a strong personality becomes his friend, and influences him to grab toys with menaces from children who appear less assertive, and give them to his "friend"? How to dissuade him from doing this without the dissuader getting labelled his "enemy" and receiving the full force of the kicking, biting, and beating over the head with the solid metal model of a cold-war tank?