Somebody commented that you had to have been in the police to understand the stress they are under. I feel the same about teachers - many parents seem to think they work the same hours as the children, but my daughter's teaching friends work most days from 8 a.m. to 6 pm. Apart from the discipline problems, especially with older pupils, there is a mountain of paperwork - reports, assessments, appraisals, marking, etc.
Things were tough when I was teaching bottom streams in inner-city comprhensives in the 1970's - I ended up several times a week with a migraine. I know they are much harder now. The problem is that because everybody went to school many people think they know all about teaching.