What to do with them? Well, the little creep who knocked the teacher out should be prosecuted and sent to a work colony. These jerks should be breaking rocks in some pretty miserable places. Then they should make films of them breaking the rocks (and getting lashed when they won't work) and the films shown to gradeschoolers. That might improve the attitudes of many of these would-be miscreants.
Good ideas. There have always been discipline issues in school. But its good to ask why was it, in 1950,or 1960, we didn’t have problems of kids attacking teachers? Why were teachers of yesteryear able to administer discipline and they can’t seem to today? What has changed? I know that banning corporal punishment is one reason but I’m sure there are other things going on as well.