Where do gangs end and insurgencies begin?

Tom Ricks has an excellent post at his blog The Best Defense on gangs in the U.S. The national security implications of drugs, gangs, crime, insurgency and terrorism are not, I feel, well understood or appreciated by the U.S. military and intelligence community (outside Afghanistan, of course, where the opium trade is now assuming some strategic importance).

I completely agree with Ricks that Mexico is a huge and mostly ignored issue.  It is, by most accounts the 2nd most dangerous potential failed state for U.S. national security, after Pakistan, and only because Pakistan has nearly 100 nuclear weapons.

However, the potential for Mexico to become another Somalia on our Southern, mostly open border is a pretty horrifying potential.....