Guns are tough. If I had one, I know it would end poorly, like turning on the news and seeing "local DJ shoots friends in foot, feels like giant turd". I'm also smart enough to see how guns/gun powder were a huge reason the country successfully separated from the England. Some Americans won't ever feel comfortable parting ways with their weapons and remind you of that right. I don't know who is right, but Cody Wilson printing fucntioning 3D handguns lends itself to potential trouble:
He's a trouble-maker but within his legal rights as a US Citizen to make his own guns. Cody also received a federal permit to distribute the CAD files. Read more here.