This is the exact opposite of my experience (and all my Japanese friends). They will stare at the person misbehaving but will absolutely not challenge him. Their culture is "avoid the problem/confronting at all costs".
> The police acts swiftly
They are considered tax thieves, even by Japanese people. Also, talk to some foreign women that got sexually harassed or even raped how the police helped them. In fact, I don't have proof, but I sincerely believe that if the police was trained well, crime rate would increase because they would find more crimes.
> healthy food
Are we talking about deep-fried food? Or perhaps over-salted dishes? Oh, no, you meant the sugar they add in basically all their cooking? Time where they mostly ate fish and rice is over. They barely eat enough vegetables. And fruits are for the well-off only.
It's a country that I love and have spent quite some time there—and more to come—but your observations are exactly the opposite of what I saw.
What they do correctly is the low unemployment rate, though I think it's starting to rise with younger people. People don't need to commit violent crimes to feed themselves if any work lets them afford necessities.