What really pees me off is teachers can no longer defend themselves against unruly pupils for fear of being charged with assault.
I remember I was only young, in year 3 I think, and we had a VERY... violent member of the class. This boy threw a chair at the teacher, Miss Wilson, and she couldn't do anything. Tbh, I think that's a pile of crap. He was allowed to return to school the next day too!
In high school, however, I did have a teacher that was willing to take a chance. I won't name him, but he was a good teacher. One member of my class was, in short, a complete and utter ****. And said teacher got sick of it, and threw a board rubber at him. I think he intentionally missed, however. It was a great sight to see the pupils face, however! Nothing happened to the teacher, but the pupil stayed quiet in class after that!