Libertarianism is essentially built on a single ethic, the non-aggression principle, which is simply that interfering with someone’s property by force is wrong.

Libertarianism is essentially built on a single ethic, the non-aggression principle, which is simply that interfering with someone’s property by force is wrong. And that property is what one mixes their labor with. In other words people own the fruits of their labor, and consequently voluntary exchange or gift is the only ethical way to acquire property. In simpler words, libertarians believe stealing is wrong and seek to apply that ethic consistently. Thus the popular libertarian maxim “tax is theft”. According to libertarians government as it’s currently practiced steals (takes by force) the fruits of individual’s labor called taxation, along with compelling the use of property through force, called regulation. The argument is more complicated than this but that’s the essence. So “left libertarians” supporting taxation for the purposes of welfare programs contradicts the ethical foundation of libertarianism. It’s a contradiction to advocate for the lack of government regulation on the basis of violating libertarian ethics while simultaneously advocating for welfare programs which violate that same ethic.