@swansinflight The union action causes short-term disruption in order to force the government to overcome its "but my taxpayer dollars!" inertia - to prevent what will otherwise be a much bigger, much more long-term problem of not having enough willing teachers for the country's population of students.
A bunch of strike days now sucks - but "Sorry, we don't have enough teachers to enrol your kids this year, and nor do any other schools in town" would suck even more.