Much has been said about America's almost religious conviction to the right to bear arms. (Not to be confused with the other religious debate over the right to bare arms.) This Wild West mentality is ingrained in the national psyche. It's second only to our devotion to personal automobiles. For a real, red-white-and-blue American, it is hard to imagine places where guns are as foreign as, well, as personal automobiles.
If personal autos are outlawed, only outlaws will have getaway cars. Or maybe we could have this outcome:
Of course, in real life it's even easier to capture trolley-riding criminals. See this story.