An increasing number of people are feeling insecure in view of North Korea's nuclear and missile development, and military build-ups in countries neighboring Japan.

Yes, and all because the right wing, Nippon Kaigi prime minister is leading the charge to go to war! Maybe if they had someone less ready to change the constitution and was not always looking to pick a fight with either North Korea, South Korea or China, they might not feel that way.

So, a majority of people are against changing the constitution, a majority of people are against the future consumption tax hike, a majority of people are afraid the country might get involved in a war...

How come they keep on electing the same politicians then ?

That’s an understatement. Japan’s neighbors are probably the worst on Earth and resort to force and threats constantly so Japan needs to strengthen its defenses considerably.

A full nuclear triad deterrent would be best as everyone would know that messing with Japan will result in being wiped off the map entirely

Of course this is the defense ministers line. Rocket science it ain’t.

It wouldn't have anything to do with the US military build up in Asia would it?