Should the US decriminalize all drugs?

No, bescause people on the street could create drugs that are deadly or toxic biologically in terms of how they make you behave and what they do to one's mind, and drugs would all be legal.

Substances that are known to do severe harm to your body and mental state are detriments to society. Though, I take that position all the way to things like cigarettes and alcohol, but whatever. Also, if you imply legal production plants for hard drugs to start springing up, there's no doubt criminal drug traffickers wouldn't hesitate burning them to the ground and murdering the founders, especially with them being such public competition. You can expect addiction rates to rise as well, since making hard drugs legal doesn't make them any less cripplingly addictive (even non-laced) and would encourage first-time users as there'd be no risk of danger from buying off the streets or possession charges. It's just way too messy of an industry to try and regulate being legal.

A country that's able to push drugs out completely and have a virtually nonexistent addiction/drug crime rate is, to me at least, a better ideal to strive towards than one where you can legally get addicted to meth, go bankrupt from your addiction and end up blowing your brains out. That's a bit on the extreme side, yeah; but ignoring the extremes doesn't mean they don't happen.

Now, what I could get behind is eliminating prison sentences for possession charges if they're determined to be an addict with personal use amounts. Mandated rehab would do much more good than just tossing addicts in cells to keep their desire to quit and better themselves at 0.