Luna tries to give back by being a teacher.

In reality, it's not easy to be a teacher. A lot of times the students will mistreat and disrespect you. Another thing is that a good number of times, the teacher gets blamed for reacting towards a student even if it wasn't their fault to start with. Seeing this video really does show how teachers are being treated in real life, and I felt sorry for Luna in how those fillies were towards her. All she wanted to do was give back to the community by teaching those ponies.