> Occam's razor. This isn't a shadowy manufacturing cabal, threatened by 3D printing. Gun control lobbyists are trying to prevent the printing of handgun frames and Glock switches, because they're the easiest parts to print.

Probably more accurate to say politicians are trying to take actions which will be seen publicly as fighting against gun crime. It seems like a stretch to say anyone earnestly believes that 3D printed guns are a real problem in the landscape of existing gun crime in America