They don't just appear. People can and do voluntary raise the money and resources to produce them. Not government even if it first steals the money to pay people to do it. Government is not the only and certainly not the best system. People build very complex systems voluntarily despite government all the time. Government is a "system" build on self-legalized initiation of force - build on forcing people to do what it says rather than what they think best individually and as a group.