This is the number one reason I left teaching a couple of years ago.
2nd reason - pupil behaviour and a lack of support to deal with it. I was sworn at, had things thrown at me, my personal items destroyed or stolen and this was primary aged children.
I would often have parents shouting in my face about the way I'd spoke to their child or their child getting a sanction or another child not being dealt with, the way they saw fit. And I had to stand there and take it on the playground in front of all other parents and pupils. It almost became the norm and we'd guess which teacher it would be next and from which parent.
I firmly believe that a lot of people who have children these days are not fit to be parents and yet these are the ones that seem to be popping them out. And this is the reason I had to leave as I was struggling to bite my tongue and not retaliate verbally.