The people of Ireland had a society for 1000 years without a state. 2 Two points that people often bring up are that man is not perfect, and that there will always be crime. They assume that anarchists overlook these basic facts. The primary reason we oppose the state is that the state is a criminal organization. It is precisely because we are aware of man's moral weakness that we want to make the powerful machinery of the state unavailable to evil men.
Anarchists use the natural law to judge the legitimacy of the various man-made laws.
3 Anarchism can be thought of as a philosophy of law and order. Like most other legal philosophies, anarchism is opposed to private crimes such as murder, kidnapping, rape, assault, and robbery. However, anarchists differ from other people by continuing to oppose these activities even when they are engaged in by authorized agents of the state. Anarchists judge all actions by the same principles, whether the perpetrator is acting on behalf of the state or as a private citizen. It doesn't matter whether he wears a badge, or dog tags, or lives in the White House, a criminal is a criminal.