Teachers aren't just under attack, they're also underpaid

Teachers face a significant pay gap relative to other college-educated workers, according to an Economic Policy Institute analysis:

Teachers working in the public sector who are represented by a union earn 13.2 percent less than other comparable college graduates. The pay gap is largest for private sector teachers without union representation (-32.1 percent). Separate analyses by gender are also presented given that the overwhelming majority of teachers are women (around 72 percent)—here female teachers were only compared to female non-teacher college-educated workers, and male teachers were only compared to male non-teacher college-educated workers. Compared to female teachers, the teacher pay penalty is worse for male teachers for each of the four teacher groups. In general, teacher pay disadvantages are mitigated if teachers are employed in the public sector—and more so if they have union representation.

And on top of that, teachers are under political attack (see this and this and this and this, for starters) and being forced to spend more and more of their time breaking their students' spirits through standardized testing. No wonder teacher job satisfaction is declining.