Every country has idealists who would prefer that the military didn't exist, or that the *insert military structure* would be relegated to a "self-defense" or "peacekeeping" force with no real capabilities to defend against a competent adversary. But it's ok because why can't we just live in peace make love not war maaaannn! Japan probably has a large amount of people who think that 80's or 90's capabilities will do today, because in their minds a status quo lasts forever, à la French and UK administrations in the 30's. Today's China can snatch an island here and there, and make retaking them quite difficult, something 90's China could only dream about. Perhaps it's easier to stick to whatever was true in some past scenario than admit a disadvantageous shift in the balance of power. There is also a small number of crazy ass nationalists who want to rewrite history and probably re-establish their lovely "co-prosperity sphere" with blackjack and Korean sex slaves.