It's barbaric what those countries do becasue someone wants to use a substance.
Singapore has so much different then the US that you can't compare. Maybe they don't use drugs culturally? It's a small country, with tons of social safety nets for it's citizens. People might not hit the same lows. It's also a city on an island. You need to isolate the variables before saying executing is effective
It’s a deterrent. Whether it’s life in prison or an execution, it drastically reduces the expected value of being a drug dealer.
Don't @ me with "appeal to authority", I admit it gladly. I don't worship at the altar of scientism (EDIT: scientism doesn't seem to be the correct word, it's not negative like I thought. I'm criticizing the "I Hecking Love Science (TM)" mentality that treat crappy non-reproducible soft-science studies as something that somehow has more value than common sense.)
You want to convince me, create better societies that are safer to live in than Singapore.