No, it wont happen. The political system would loose legitimacy in the eye of a lot of people, and they need all the fools believing in "the best interest of the nation", the "greater good" and "I do it for your well being" to stay in power.
This is why de-centrallization is so important. They can easily streak down one central point, but they really can not go against everybody.
You have to understand the government though. They use propaganda to push their agenda. Why do you think the mainstream media demonizes Islamic culture? They do that because it makes people feel less empathetic towards the innocent people who get killed in a bomb attack or raid etc.
It could happen.
Just look at what they did to assange. They couldn't get him on traditional charges so they do other things to try and trap him. Isn't it kind of ironic that shortly after the leaks some random ass lady shows up and files rape charges? If he ever went to trial they will just make up fake evidence to find him guilty.
What they will do is demonize bitcoin. They are already doing this. Note how the politicians and media constantly note that bitcoin is being used for drugs and gambling? Why do you think that is? Its designed to make bitcoin sound like some shady criminal system. Even though the vast majority of people don't use bitcoin for illegal activities.
If they do make arrests the media will spin it so it sounds like the people they arrest are drug dealing, money laundering criminals.
You have to understand that Americans aren't exactly the sharpest tools in the shed. They are EASILY manipulated by the main stream media.