Any principal who is worth his/her salary can remove an unsatisfactory teacher if he just does his/her job.
Sometimes they spend a little too much time "chewing the fat" with the PE teachers instead of having a presence in the building and dropping into classrooms. I have been on both sides. It is not that hard.
Sometimes districts decide to save some money by hiring a bunch of new teachers, instead of retaining veterans. Tenure can prevent this.
What if hospitals decided to give no security to experienced Doctors, and hired fresh new ones every few years?
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