I think that what gets down-voted is more the implication that making drugs offences capital crimes is the chief reason Singapore and Indonesia have lower drug

I think that what gets down-voted is more the implication that making drugs offences capital crimes is the chief reason Singapore and Indonesia have lower drug usage rates. I believe that more significant influencing factors are that drug usage is socially unacceptable Singapore and Indonesia, that citizens are more willing to accept government control over their private activities, that drugs are harder to acquire. It seems more likely that those countries are able to have capital punishment for (what the West would consider to be) minor drugs offences precisely _because_ drug use is already low and drug users are more consistently vilified by society.