Libertarians deeply want to believe that we live in a world where you can leave people free to transact freely in a free market, and that will maximize total value. And economic theory tells us that isn't true.
Once that ideological purity is lost to brutal reality, libertarians are stuck fighting in the mud like the rest of us: arguing over which particular bits of government intervention maximize value without much in the way of theoretical projections or empirical proof.
Libertarianism isn't about maximizing total value; not if you're intellectually consistent about it. Most libertarians see libertarianism as a moral imperative and respond to arguments about "maximizing total value" with "the ends don't justify the means".