Postwar Japan has done a lot of preparation for natural disasters but has had essentially no civil defense measures against military threats. That might be changing, though. Just a couple of weeks ago, for the first time, the city of Tokyo designated 105 subway stations as emergency evacuation sites in case of missile attacks [1, in Japanese]. This was prompted not only by the continued threat from North Korea but also by what has been happening in Ukraine.
[1] https://news.yahoo.co.jp/articles/34fd48f39ee9b8a78197f350e8...
I am tempted to speculate that the average Japanese civilian is more worried about the threat of North Korea than the average Korean civilian.
They have exactly that threat from North Korea. But I suspect that the culture of "rampant consumerism and materialism" is part of how they deal with that (also the cuteness thing he mentions possibly plays a part)