Los Angeles, California is about the same size as Singapore with about 3.5 million people. Singapore has an immediate mandatory death sentence for those who fire a gun during the commission of a crime. Twenty offenses carry the death penalty. Firearm and drug trafficking offenses carry the most swift punishment. Twenty two of those who were hanged were convicted of drug trafficking.
Capital punishment is a definite deterrent to crime.
An executed criminal cannot commit another crime. The USA can learn a great lesson from the Singapore caning experience. In fact we could learn so much about punishment as a deterrent to crime, with legal justice reform, we could apply billions of dollars in crime costs and crime bills and completely eliminate the government deficit with the savings on crime costs in a short period of time. We have three or four generations of Americans that have leached onto the great welfare system in America. Beginning with the great society under Lyndon Johnson, the welfare program took its real roots.