Shouldn't just teach kids that they have the right but a duty to join or form a union.

We should make that shit more important than voting. It has significantly more impact on the lives of the working class than which bourgeoise party wins. If voter turnout were the same as union membership shit would be drastically different... And the votes would be different as a result of the power of those unions too. Would it magically create socialism? Nah. But things would be entirely different.