Because the world needs more guns.
The world's first gun made almost entirely of plastic parts produced on a 3D printer has been successfully fired in Texas:

The US group which created the firearm, Defense Distributed, plans to make the blueprints available online.

Do you think this is "about liberty", as the designers say, or a dangerous step that could put weapons into criminal hands?

How should legislators and law-enforcement bodies react to technological advances?
Shared publicly