First, I'll apolgise for using a TVTropes term, but it is a useful shorthand.
Binns, the nortoriously boring history teacher.
Why does he keep his job (at least over the timeframe of the books)?
Because the political problem of replacing him. Should he be replaced, they'd be a lot of pressure from certain parties about who should replace him and what slant should be put on history lessons.
Binns, the nortoriously boring history teacher.
Why does he keep his job (at least over the timeframe of the books)?
Because the political problem of replacing him. Should he be replaced, they'd be a lot of pressure from certain parties about who should replace him and what slant should be put on history lessons.