I could 'create' dollars too if I had a lot of resources the forge bills and coins. The point is any government can fuck with a currency.. what's new? There are plenty of ways to defend against attacks.. I was around during the P2P client wars. I know all about it. Back when the RIAA was trying to disrupt file sharing networks there were trusted/signed black lists of bad hosts to exclude from the network.. and that is only one defense type, there are many.