I think their (the ones who post Youtube videos about it anyways) goal isn't to make gun parts, but to show how laws that restrict some magic block (that can be

I think their (the ones who post Youtube videos about it anyways) goal isn't to make gun parts, but to show how laws that restrict some magic block (that can be milled, carved, or printed) have nothing to do with making anyone safe. They probably see that 3D printers are too widespread and too economically game-changing to be banned, effectively at any rate, and thus that by showing how printers enable production of something, they can show that regulating that thing at the historical source is going to be ineffective. I imagine these people are your allies more than you think.