The claim was Japan is a "pretty good country" to answer your question of "...which country with a lower % of white population than the US do you find superior to the US?"
Whether it's better for you, personally, is actually irrelevant.
That said, it seems some of your dismissal of differences, that don't matter to you, are "flawed".
1. there are other ways to be infected with HIV/AIDS other than IV drugs or sex with gay dudes.
2. 'fewer babies' is is a metric describing their country. It's NOT a requirement (so have as large of a family as you wish).
3. 'less likely to be in prison'. So, you believe that ALL the people in prison are there because they commit crimes? Seriously???
4. Less health cost/lower infancy death rate. Glad you're healthy and you made it through infancy OK. So, "you got yours" and your health will not ever change. LOL!!! Do you realize other peoples' health affects society as a whole (even you!)?
5. 'consume less oil': The Japanese tendency to not own cars is, again, a metric. It is NOT a requirement. You want a car? Fine. Apparently, 78% of their households do (not a vastly different percentage than the US, BTW). I think you'll find there is less car use since the structure of their society (culture, infrastructure, etc.) is such that a car is less of a necessity in their society.
6. 'make less money'. Well, that might "suck" or not depending upon other factors: cost of living, leisure time, benefits, etc.
All of this is fine/dandy, but it doesn't address another factor: crime rate. Of course, I'm sure, there are better/worse areas in either country, but overall it looks like Japan would qualify as a "pretty good country" (which is what the topic is!).