Quoted from GhostThruster:How would the government pull the plug on cryptocurrency? I can understand how they could tax it so heavily or make it extremely painful to continue using that most people would stop dealing with it but isn't a major point of having a decentralized blockchain so that no one person or group can easily influence it or take it down?
Simple - same way they have combatted online gaming. Cripple their (legal) ability to work with credit cards and banks and combat sites. Make it hard to move money to/from US banking and you choke the ability to operate with US customers.