Why does the Japanese government establish the curriculums of all schools in Japan

MEXT (Ministry of Education, Culture, Sports, Science and Technology) establishes the curriculums of elementary schools and high schools. Even private schools obey these curriculums. MEXT approves all textbooks to be used in all elementary schools and high schools, too.

When some university in Japan wants to establish a new department, they need the approval of MEXT, even if it were a private university. MEXT checks in very close details.

Why does the Japanese government establish the curriculums of all schools in Japan? Japan is a totalitarian country, isn't it? What's different between Japan and North Korea?

MEXT decided that dance would be taught in gymnastic class in all junior high schools. Many gymnastic teachers are learning dance hastily, now.

I don't oppose teaching dance in junior high schools at all, but I can't understand why the Japanese government decides it and all junior high schools concurrently begin to teach dance.

Everyone has the right to receive education. I think that everyone has the right to receive education that they want to receive.

It's quite ineffective for all students to be taught in the same curriculum. Everyone should learn in their own way.