Almost right. Think of it as anarchy=self government in the absence of organized government, and you have the ultimate philosophical goal of libertarians. We are adults. We act like adults. We treat others like adults. Formal governments are for those who need an authority figure to punish them and tell them when they stray off their moral compass.
Libertarians don't need that.
You are awfully ignorant of things like "social pressure" and being an outcast aren't you? If you don't want a drugged up customer stinking up your store, kick them out. If you don't want to be kicked out of stores, don't be FUBAR when you head out your front door. Easy-peasy.
And no, your Snake Pliskin example is ludicrous. Nor is it in any way accurate. Don't be stupid.
But you see the one thing that stands in the way of a libertarian utopia is the same that will never allow for the socialist utopia that leftists dream of.
That thing being human nature,which is comprised of such things as greed,laziness etc.