Quite frankly, death penalty, like privacy, is highly culturally influenced. That part is never going away until there is a societal-level change, with or without conflict.
Deterrence in prison is a curious notion, though as far as I'm aware it's more likely to be enforced by inmates than the correctional system (snitches get stitches). Someone correct me if I'm wrong.
Krasny-Volny wrote:Singapore has what is arguably the lowest crime rate in the world, and back when I lived there, also the highest execution rate next to Saudi Arabia.
I’d say the harsh penalties inflicted there for the most minor of offenses have created a deterrent among the small, densely concentrated population. There’s simply nowhere to hide from the very efficient police force. They will find you and you will face those stiff consequences, guaranteed.
It’s harder to create that mentality in the US due to varying levels of antipathy and less trust of the police and government in general, plus the fact that it’s far easier to get away with crime due to the massive size of the country and population. My theory is that this balances out the deterrent effect that might have worked for Singapore.
Singapore also has total civil involvement, unlike the U.S. Conscription, Total Defence, not even the whole nine but the whole fifteen or eighteen. It's less about deterrence than participation. Granted you will still have the occasional oddballs like these...then what do you say about Hong Kong, similarly a former British colony and similarly one of the two often compared when it comes to most effective policing, among other parameters, but WITHOUT capital punishment?
This is ultimately one of those things that is too complicated to have a generalized answer.