My son had a tremendously difficult time in preschool with his behavior. One of the ways we were taught by the teachers to mitigate this is that we use a method similar to this. When he would bite, kick, or hit, we would greatly overreact in pain or sadness to discourage him from doing it--to teach him that those things hurt people.
That helped. But his behavior continued to be a significant problem despite various professionals' best methods until the pediatrician began treating him for ADHD. Then we had a complete and total 180.
I wonder how these people would deal with a situation like that? Would we have gotten a better outcome and not had to go a medical route?