That doesn't really explain anything. Are those gangs in the military people who were raised with a healthy respect for weapons?

If anything it just proves how dangerous the military is and how much of a danger they pose to us and why we need more people owning guns. If they're turning out super criminals then disarmerment isn't the answer.
"the fundamental principle that a government and its agents are under no general duty to provide public services, such as police protection, to any particular individual citizen." Warren vs. The District of Columbia.