In a civilised nation, the authorities have to prove you broke the law, you don't have to prove your innocence.
The Office of Defense Trade Controls Compliance emailed Mr Wilson a document demanding the designs be "removed from public access" until he could prove he had not broken laws governing shipping weapons overseas by putting the files online and letting people outside the US download them.*
Never mind the issues surrounding the fake scare over printing a gun, the way the USG are dealing with the issue is unquestionably wrong, especially in a country that is a signatory of the United Nations Declaration of Human Rights.
Sort it out, America.