In the hysteria about 3D printed guns, the words “unlicensed and untraceable” are thrown about promiscuously and irresponsibly. They are used to imply disaster is upon us, that some new scary threshold has been breached. They are scare tactics based on ignorance. Most of the 400 million plus firearms in the United States are unlicensed (unregistered) and untraceable. It has been that way for decades, hundreds of years. It has not made a significant difference in the crime rate. It will not make a significant difference in the future. Separate from gun licensing, there are background checks at retail...