>It’s cheaper than the alternative, though, if there is rat poison in it, there is nothing you can do!

Sure there is, I can take you to court.

>Caveat Emptor is a shit way to run a society. It incentivizes the sociopaths.

Bureaucracy and nanny states do that too.

>Both Hippies and Libertarians fail to understand that if your organizational principles don’t account for sociopaths, they will take over and ruin everything.

I don't think the latter are against locking people up. Or executing them even!

And the former, I dunno, perhaps they handle them Midsommar style!

Not to mention the issue is quite solvable: sellers can sell whatever, but need to specify the contents and whether they match a specification (e.g. same contents as aspirin). If you want to buy rat poison drug or heroin cut with sawdust, it's on you.