Earlier quoted context omitted.
Libertarians typically want a small state that uses its monopoly on violence solely to protect citizens from aggression.
I have never quite understood why libertarians think that is the precise optimum for the amount of government activities and their "theft" of my money via taxation. Don't libertarians understand or accept that there are market failures that government is needed to solve? Or do they think that in every case government makes more bad than good when trying to solve market failures? Or is it just that freedom of individu…
Many forms of libertianism are deontological (based on principles, e.g. "natural rights"[1]) rather than utilitarian (based on ends). A libertarian might believe that if they obtain something either by finding/making it or accepting it from someone else, potentially in exchange for providing some good/service to that other person, then they have a natural right to that property. This means they'd view it immoral for anyone else to take it off them without their consent, and hence oppose taxation. Some Christians are also libertarian for this reason: they take "Thou Shalt Not Steal" as an absolute, not making exception for people acting on behalf of others.
Such Libertarians generally support only "negative rights", not "positive rights". A negative right means the right to have other people not interfere with you (e.g. hurt you or take your property), while a positive right is a right to have other people do something for you (e.g. feed you when you're hungry or pull you out of a river when you're drowning). Many concepts of "market failure" only make sense when assuming the existence of positive rights: that the other people/the market owes you something or should work towards some specific end. Libertarians would hence not necessarily consider these a failure: from that perspective, the immoral thing is someone killing you, not necessarily you dying per se, if no-one is actively trying to harm you. There are also some forms of market failure, however, "negative externalities", that many libertarians do believe in, and the proposed solution is to strengthen property rights (so e.g. class action lawsuits are allowed against any kind of polluters, and unlike the BP lawsuit the government cannot cap the payout).