There is no other way that the "armed safe" scenario could possibly be in existence.
And why is that?
Well, no restrictions whatsoever includes no safety regulations, no nothing, Machine Guns included. There'd be vast amounts of stolen guns and no way to track them. Just for one thing. (no other possible way is too harsh though. no other at all realistic way is more like it.)
As to Opebo, actually poverty doesn't necessarily create crime, but a large income gap does, as does an uprooted society. Murder for economic gain is always going to be far more common if you hardly know your neighbors.