Rhetorically speaking, I'm I my brother's (sister's) keeper? (BTW, I'm not a teacher)
Why are you vilifying "teachers" for your personal perception that "they" turn a blind eye to abuses? Teachers are NOT EMPOWERED to discipline each other, so your expectation is misguided at best. The principals & VPs know full well what the teacher is doing, but don't feel compelled to discipline the teacher. That kind of behavior is common in large organizations, by the way. It's not just "schools." 
You may continue to demonize teachers; it's as easy as lying. The profession is 75% female. Why not criticize the fairer sex too, while you are at it? Might as well.
Point is, there are great teachers, and terrible teachers, but one should not paint with a broad brush and punish all for the sins of a few. That's behaving like the terrible teacher who punishes the whole class for the four naughty boys shooting spit balls at her.