There’s nothing selfish about wishing to be left alone, and not be forced to do things to which one does not consent, and not be forced to buy things which one does not want to buy.
Also, when born into a system that forces you, on threat of violence, to participate in it, there is no peaceful alternative that permits an opt out, so saying that those people benefit (in your view) when they have no other option, is extremely disingenuous. Do people also benefit from the war on drugs being waged against them?
There are lots of legitimate critiques of libertarianism. Neither the false dichotomy nor the ad hominem you offered are among them.
Not everyone agrees that that particular form of stability and security that you seem to think is such a huge benefit is worth the cost: specifically, that every person alive in a certain region must be forced, on threat of violence, to pay and participate in that stability-providing system, even if they vehemently do not consent to such.
Perhaps you value stability and security above all else, and think it’s a good deal. Others that do not, and consider the price (morally, in the legitimization of armed robbery, to say nothing of the dollar figure) too high, are not being selfish by having those values.
Libertarianism is not the opposite of “socially interdependent”. It’s the opposite of “forced at the point of a gun”.