Many of the people who are strongly in favour of this anthem are right-wingers who believe in the absolute power of the Emperor. For those of you who have forgotten your Japanese history, these are the same people who got Japan into WWII, deny any Japanese atrocities and, in general, are pretty oldschool hardasses.
This is their victory, and it does sadden me a bit. From The Mainichi article:
"Their act of not standing up caused distrust toward school education among parents and other people, and the punishment of pay cuts was lawful," Presiding Judge Shoichi Maruyama said in handing down the ruling.
Regarding the disciplinary action against the teachers, Maruyama said, "They disrupted the atmosphere of a ceremonial event, violating the Local Public Service Law. Disciplinary action is appropriate."
In April 2005, the Fukuoka District Court had ruled that singing the national anthem as a school event did not violate the neutrality of education nor violate freedom of thought as stipulated by the Constitution.
That's right, the one thing you're guaranteed to learn in Japanese schools: blind obedience.