School tax does a few things.
1 - Money to provide a better school district.
2 - Better school district also means higher value for your home.
3 - Kids are involved with pre and after school activites... a lot less mischief to get into.
4 - Schools can provide latch key for younger kids, keeping parents in the school district, which helps local economy.
That's some of the things I remember from on of my tax classes... <shrug>