In 2011. Somalia had no established and internationally recognized government.
In 2011, the United Nations Office on Drugs and Crime did a study on intentional homicide rates. According to this study, Somalia had significantly less intentional homicide than the United States.
After the establishment of the Federal Government of Somalia in 2012, Somalia's intentional homicide rate skyrocketed, more than tripling the kill count, far surpassing the United States.
Could it be the lack of reporting? The urgency increase for aspiring warlords? Could it be that Somalia is a greatly impoverished country that has been picking up the economic pieces from the rise and collapse of state socialism, since 1991?
The people of Somalia, having never learned of self-ownership, still had rulership as an accepted part of their culture. Could that have invited the power vacuum, enabling faction wars and new government?
Could Somalia have become the anarcho-capitalist paradise it should have, if it had been an economically stable and educated nation without the shackles of statism?
Comment your opinion!
As far as I know Somalia was also a great example of jurisdictions in competition, which is one of the forms anarcho-capitalism can adopt or a way to approach it. Functional Overlapping Competing Jurisdictions may be the best idea to experiment with different laws and forms of anarchism.
I would say it would be the inability to collect data. Murders don't get reported if the people to report them to are indifferent. Different clans and factions fighting for control and territory do not usually make for a peaceful place.