...these are the decadence of politics that happen almost anywhere. It'll be only too obvious that you will feel that you are alone in this world, knwoing everyone else is agaisnt you, calling you names, and accuse you of being idealistic, until of course, until you met people who share the same ideals as you.

You're not alone about this. Let's just say there was a system that is actually running the society so perfectly that it will warrant anyone to be as malicious as you've stated about the principal and the backstabbing teachers. It is a form of decadence, and the bad news is:

Only a few are aware of it, and many of them rather succumb to it.