Response to Rothbard:

If I refuse to agress against an innocent third party while trying to repel an attack from a second party, my refusal puts me a disadvantage. (For example, use of innocent human sheilds.) Over a long period, all libertarians on average can be defeated due to this disadvantage. (I think this effect has in fact shaped the world we live in. Libertarians and pacifists are few because most of them were killed off.)