Justify their claim, that they help. However, these justification, this preemptive allowing, excepting, justifying, pre-preemptive bowing, it doesn't mask the actual harms of the policies/designs which were justified. It also vastly reduces the bargaining power of the people that so many of them are almost preemptively bowed and justifying.

Voluntaryism, anarcho-captialism, anarchism:

Pros:
BETTER LAW SYSTEM: voluntary legal-contractual system lets the free will of all peoples compete against each others choices/preferences. Nigh absolute individual legal rights. Evoluntionary, emergent, responsive, more "democratic" than "democracy's" laws. Overall superior, cheaper, and faster results in most situations
BETTER FOR THE POOR: Chiefly by giving free immigration and trade to the international poor. Then by increased production, goods, and jobs overall (increased charity as well), no taxes on the poor (they effectively have 30% - 70% more money, unless they had active welfare or other unique situations). Note the true poor in america are often not taken care of by welfare, as they are often not a voting population either by lack of house, citizenship, or felony charges. Less laws against these poor and others, committing perhaps more harm than all welfare combine (especially obvious if including boarders).
BETTER HEALTHCARE: Less taxes compound within the healthcare industry to a cost reduction of between 30% and 70%. So, already a healthcare plan of 30%-70%. More competition, less mercantilism/cronyism is another ~10% - 50% off. No IP laws means maybe 10% off. LEADING TO 40% - 85% CHEAPER HEALTHCARE. Overtly superior to many medical insurance plans. ((Not, i have somewhat capped some of the benefits here, as they can sound too incredible))
LESS WORRIES: Of turn key tyranny, cronyism, a corrupt unmoveable fake democracy, breaking an unnecessary law, of going to war (*), or of dealing with an unending media/political landscape designed to manufacture consent to mold your mind and do bad stuff.

Many more benefits!

Cons:

ROADS: Anarchist are incapable of building roads, their arms are feeble and their minds lack the steely eyed resolve only national leaders can possess, this is necessary for building roads. Any possible roads will be as feeble as anarchists' limp wrists and riddled with toll booths ever 3 blocks.
FOREIGN INVASION: To stop an ideology that proves their ownership of human cattle is unnecessary (to the human cattle). Regardless of this place quickly becoming an inferior target for military invasion compared to the disarmed populations of other smaller nations.
OTHER ISSUES that are relatively negligible or likely to be/become pro's: Several

Anarcho-capitalism is a meme name, nearly, call it anarchism, political anarchism, or voluntaryism.