To me if a certain method of organizing fails to give people power over their own needs without infringing on the needs of others than it should be avoided. Privatization of -everything-, which is core to ancap theory, is itself an aggression. The enclosure movement in the UK is a good example. The ‘best’ way for people to organize would incentivize people to be good towards each other and good stewards of the planet. It would not allow one person to gain power over anyone else’s right to exist. You should be highly skeptical of a movement whose theorists support slavery, free market organ sales, etc. which are antithetical to freedom of the individual (at least one person in the relationship is getting the shitty end of the deal).