I had one son with ADHD and high functioning autism, and another with ADD. They never had temper tantrums, in or out of our home. If they disobeyed they got spanked. Fortunately, as they were raised with boundaries and knew right from wrong, we didn't have to spank them often, and my daughter, never.
I also worked with two classes of disabled kids, with everything from Prader-Willie Syndrome to autism, developmental delays and physical handicaps. I never had a problem with them in many years. In fact, they constantly sang the songs I taught them, and asked the regular teacher when I was coming in.
I did have one student in an inner city school, who came from a very disturbed environment, who went beserk on me for no reason I could tell. He was attacking the other students, and throwing desks around, at age 6. I lifted him from behind and carried him to the principal's office, where he was sent away never to return, since he was out of the catchment area of the school. I was glad I was a parent, and I could recognize his severe mental illness and do what was necessary to protect him and the other students. But that was once out of 20 years of teaching.
I am not sure why people are fighting about the police. I know in Canada we respect our police, even though there are probably a few bad apples in the bunch. I don't like the baiting that has been going on in this thread!