Teachers have a vastly over-inflated sense of self-importance. Hence all the bullshit they pull off.

Plus, it's almost impossible to get teachers fired. Being a teacher is seen as a life-time appointment with no chance of loosing it. Ever. The moment there's even a whiff of government activity that suggests teaching might loose funding, they go completely political and paint their opponent as a heartless devil.

School systems tend to be utter clusterfucks, from top to bottom.