Just google "But who will build the roads?" and you'll find all the explanation you need. And anecdotes like this this:
"Who will build the roads?" is a question that belongs at the top of every libertarian drinking game. If we didn't have state coercion, the argument runs, there would be no roads. There'd be a Sears tower over there, and your house over here, and everyone involved would just be standing there scratching their heads.
(fwiw, we had private roads all throughout American history, and in fact the first government-funded transportation in North America was water canals.)
Please note the distinction between ethics and morals. The former is always objective. No matter who you are, no matter what race you are, it's always wrong to kill, steal, defraud, or otherwise initiate violence. The laws written down are just a codification on how to establish justice. They might vary, but they're all pretty good substitutes for each other. Some locales might have slightly different understandings: In the US, you're expected to pay for you food after you eat it; and not knock on people's doors at unreasonable hours of the night, so there might be a law saying "no unsolicited knocking on doors after 22:00". These are fine.
Morals, by contrast, are something we learn after reading a bedtime story. Probably good advice, but not necessarily true, depending on the person's exact situation. Don't go into excessive debt is my favorite.
The issue is never about government per se, but it's about rule of law. The Framers intended the Federal government to be as close to anarchy as possible while keeping rule of law, and indeed that is the only ethical thing is can do. If the government is indeed a government of the people, it can't do anything that one person couldn't do by themselves.
For this reason it's impossible to add "unlawful" to the definition of "theft" because then by definition, the government can't steal. This directly contradicts the notion that the government is accountable to the people. Theft is theft. If I own it, and it's taken from me against my will, it's theft, period.
If it's absolutely necessary to have some theft in order to keep rule of law for everything else, fine. But don't pretend that the trillions of dollars spent on warfare, welfare, and bailouts is protecting the rule of law in the slightest bit.