I could write a book about my thoughts on this, but let me just give the core summary. Any population of human beings that is representative of actual human beings and not specially crafted will have a subset of people who seek to profit from criminality. Left alone (and even with quite a bit of interference) they will form into gangs and dominate the non-criminal people as well as fight each other in tribal wars.
The only way to free a people from such a Hobbsian state of affairs is via the formation of the Leviathan, the powerful government and police force that is more powerful than the most powerful of the criminal gangs. This necessarily has a monopoly on force, or else it operates just like yet another gang. If it succeeds in its monopoly on force, even if it starts out composed of the most noble souls, it will draw criminality into itself as people who seek to profit from criminality see an opportunity to do so by corrupting it.
Once such a leviathan exists, it will morph in predictable directions which will run roughshod over your beautiful anarchocapitalist state.
Luckily it leads to a state that is much less violent than tribal warfare. Unluckily is is never anarcho-capitalistic.
Every description of anarchocapitalism I've heard of fails to address the reality of this situation. Of course I'm probably ignorant in this arena, but this was my general conclusion back in my 20s when I considered anarcho-capitalism.
For more detail, read Leviathan by Thomas Hobbes.