Sure, we agree there too. The question is which action creates the most consented relationships and which creates less. Because like in the Austrian School, the measure/weight of value is subjective. The same has to be true in moral discussions, because true morality is born or discussed in the real world and thus it's always as complex and subjective discussion.
I think it's the real politik, utiliarian view vs the purist view, i.e more people having access to a 50% voluntaryist system vs less people having access to a 100% voluntaryist system discussion. It's hard to measure but both are heading in the same direction.
This is I think both the purist and real politik people are right and both are necessary, because the measure of necessity/moral value is also subjective by definition.