It does nothing except defend teachers - whom don't do their jobs or abuse their powers - from being fired... making them immune.
The system isn't effective. It creates a way for teachers to dodge anything that might normally threaten other people from being fired in different professions.
I believe in ending tenure but only in k-12. College professors should have tenure iy actually has a point for them.
No.... Are you asking at the primary school level only? Regardless, no...