I have met very few teachers that are "noble". Many of them cheat their way through their boards and should be considered indoctrinators instead of educators. Have you noticed the trend of teacher/student affairs recently?
I have seen many teachers who only "work" 9 months out of the year, yet strike because they didn't get a pay raise, but are already making $50,000 per year, not including their retirement package, perks, holidays, and health care packages.
If you want to see how noble this profession is, then don't give in to their next contract demands. I promise you - they will strike as quick as lightning and leave your children high and dry. They don't care if they leave your children unattended and they don't care if your children ever learn another thing again.