Nope, wrong. The U.S. Government has the power to decide whether or not you can leave the country. If you attempt to leave the country after they decide to specifically bar you from leaving by denying your passport application or denying you at the border, you could be arrested or shot at the border. How the fuck is that a "freedom" if someone else gets to decide whether you have it or not?
"Tyranny of the majority" for sure.
Please explain why you think the tyranny of the majority deciding that we should keep the NSA and other departments meets my needs as a U.S. citizen, and without some off-the-cuff false-choice crap about "you have a smaller chance of getting your legs blown off after running a marathon". Please explain why the U.S. being a "superpower" benefits me as a citizen, or benefits the citizens of Pakistan, Libya, etc, seeing their family members being blown to bits by predator drone strikes and aerial bombs, and landmines left over from previous wars, and uranium bullets used by U.S. troops giving people cancer. Superpower indeed.
Power should be as fragmented as possible so it can do less harm.
Keywords highlighted; if you decide right now to leave the country, you are free to do so - UNLESS you are a person of interest against whom an order (as you hint at) has already been made. So don't pretend you're stuck here. If you don't like it (it being the system within which the group of people that call themselves the USA has decided to live), without wanting to sound overly harsh:
fuck off go elsewhere. You have that freedom! Even Snowden had that freedom; had he chosen to do so, he could have quit his job quietly and left the country. (Ignoring for a second whether, morally speaking, that would have been the right thing or the wrong thing to do.)
Obviously I don't expect you or anyone else here to up and leave the US (unless, perhaps, you already live abroad and taxes are an issue). The vast majority sitting at their keyboards will weigh-up the opportunity costs and very quickly decide it makes absolutely no sense.
As to the tyranny of the majority statement... Really? You don't see how protection of US national interests has ensured and affords you the freedoms you enjoy today? Are you serious? Without these protections every other country that DOES actively protect it's own interests would quickly dominate the US. Try to remember, this is not just about terrorism. For decades now the US government has tackled - on a day to day basis - political and corporate espionage, hacking, spying, sabotage, etc. Without government level protections, the US simply would not exist in the form it does today. You certainly would not be enjoying the freedoms you enjoy today.
None of this means we should let the NSA or any other branch of the government run wild. But the question becomes, "how do you keep X in line, operating within the boundaries we set?" So instead of indulging in your plight, why not suggest a viable answer?
(All this is way off topic. Sorry.)