My friend Rob Wicks said this in an email discussion:
Minarchists, while practically better than socialists, strike me as perhaps more intellectually dishonest. The better socialists don’t believe they are doing evil. Minarchists, it seems to me think that by “properly” doing wrong, you get to lower the overall amount of wrongdoing. They believe in evil management. They make no distinction, essentially between doing evil themselves, or having others do evil. Whichever one seems subjectively better is the one they would support. Minarchists cannot coherently object to black slavery, if it could be shown to lower the overall murder rate, for example.