They are general rules that we've set up to manage society, but unless you have the ability to back up your stance with force, who to convince someone else to back you with force, "legal positions" are meaningless.
These "market anarchists" have an odd need to believe that the literal interpretation of human-dreamed-up laws would will be sufficient to protect them forever. It seems like this belief goes with the need to believe that in their future "selfish-market-behavior-creates-mutual-benefit" society, the stronger won't use their strength to subjugate the weak.
Not to mention that every attempt at basic administration of society is viewed as a violation of the rights of the individualists living their libertarian values so you end up with nothing but dysfunction and a breakdown of society.
These "market anarchists" have an odd need to believe that the literal interpretation of human-dreamed-up laws would will be sufficient to protect them forever. It seems like this belief goes with the need to believe that in their future "selfish-market-behavior-creates-mutual-benefit" society, the stronger won't use their strength to subjugate the weak.