Aside from the major differences in social pressures others have mentioned, you've also completely missed that they have free universal healthcare in Japan. One

Aside from the major differences in social pressures others have mentioned, you've also completely missed that they have free universal healthcare in Japan. One might ask, how would drug addiction and mental health improve in the USA if we had free medical care and mental health care? Sad that you're so quick to chock up issues in the USA to "not enough of us are nice people" when there are huge material differences between the USA and every other developed nation.