http://www.gnu.org/philosophy/right-to-read.html
What is the solution if a person uses a printer to print devices that are used for what most people consider criminal behavior? For example, someone printing high performing secret remote detonating bomb materials for political enemy rallies. After they serve the prison sentence. Do you let them own an open source printer again and let them use it without restriction?
With the power to print "anything" at low cost comes a tremendous power to kill thousands, even millions of people easily. How do you find the balance between freedom to let people print anything their hearts desire, and restrictions to stop the evil people from using that tremendous power for great evil?