Hate to say this, but those cops were exemplary. Even special needs kids need to be helped to act in a civilized way.Human nature just tends to do the unacceptable until appropriate push back is meted out by those who love him/her enough to discipline.
Follow up would be interesting with little treasure of a scared , previously apparently undisciplined, child. He may have learned a much needed lesson the hard way and has done some growing up.
My theory of child raising which I passed on to my kids is discipline your kids when young with little tap on diapered butt with all the love and hurt in your heart because if you don’t, the society will discipline without that love.