One of the most amusing things one hears from especially union ilk school teachers is this we are professionals drivel-- like doctors, lawyers, and CPA's, e.g.
The problem with that facile, presumptuous self-love is that the vast majority of school teachers do nothing to achieve what one might reasonably call professional status. Teachers colleges and education degrees are a farce in terms of academic rigor. A degree in "Education" with a focus in English is NOT a degree in English. And while many gets "masters" degrees, the same lack of academic rigor holds true.
One thing that began to hurt teaching was women's lib...in the 50's some of the brightest in college went into teaching, but later that average aptitude plummeted.