Where only the criminals go armed.
Falcon Lake is an international lake, straddling the Texas-Mexico border. The fishing there, I've always heard, is spectacular. Due to the agreement, a fisherman can fish from one shore to another, but down the center of the lake is the international border. One shore it Texas, and the other is Mexico.
Lately, some Mexican gang members have been boarding anglers' boats by force, robbing the fisherman at gunpoint. They at first claim to be federales, but they get spotted for the gang members they are, pretty quickly. They are criminal predators.
So, here's the interesting part-- the attacks are ALL taking part on the Mexico part of the lake. Not in Texas.
Because the pirates know that it's against the law to carry guns or ammunition into Mexico. It's almost universally illegal for Mexicans to carry weapons of their own in Mexico, as well. Thus, if the gangsters attack people on the Mexican side, they will receive no armed resistance. The Mexican law protects the robbers.
Of course, it's against the law for the gangsters to have guns, too. But seeing as how they're engaged in organized crime, conspiracy, and armed robbery, just to name a few, they're not really worried about breaking a little weapon law. You know who worries about that? Law abiders. A.K.A.: their prey.
We would do well to point to this superb example of the unintended consequence of gun control, the next time someone suggests that it would be safer if you would just pass another gun law to protect the populace.