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You're absolutely right. They will still want to traffic drugs, but they'll be in prison rather than out on the streets, so they're ability to do so will be severely diminished. Additionally, you seem to think we should just let them get away with selling drugs. You know, lots of people make their living off of thievery, and they'll continue to steal, so maybe we should just let them get away with that without consequences."
Get away with selling drugs compared to thievery? I'm pretty sure drugs are a commodity which follows the rules of supply and demand, and the government should the taxing the trade (like it does with alcohol and tobacco) rather the prohibiting it (which wastes police time, prison cell space, customs officials energy - all of which could be redirected towards drug treatment and rehabilitation)
But maybe that's just the liberal side of me which believe in free trade and market mechanisms... (No it is the socialist side which believe in social justice and spending money to solve social problems rather than making them worse...)
If you make the crime punishable by death, only desperate people will risk handling the drugs, and organised crime gangs will exploit the most desperate people to ise as mules, growers, distributors, etc. You will not stop the trade, you will merely make it more desperate and put presure on the weakest, most vulnerable people in society. (Just like banning abortion doesn't stop abortions from happening, it merely stops safe abortions, and hurts the vulnerable in our society)