There are so many students who get picked upon. I actually have proof of a teacher telling a student, "You should be sad of your sorry existence." Yes, you may believe that the child deserves it because they did something wrong, but that is no way to treat a child. Plus, adults are supposed to inspire younger beings, and bullying is not inspiring. Also, there are so many students who get picked on and blamed for things they never done. Even worse, when another student stands up for the victim, they have to endure the teacher's wrath. What happened to our freedom of speech?
Another rather more minor problem is many children try so hard to be smart, yet they don't do good in school. Not every human in the world is genetically engineered as smart, and that is very unfair.