I feel you. I left about 3 years ago for a mixture of personal reasons and increasing discomfort with the direction of the country.
Not only do most Americans seem oblivious to their loss of personal liberties, but they also are also apparently unconcerned with the widespread havoc wrought by US foreign policy. Now after 3 years of living in one such country that got deeply fucked over by the apathy and ignorance of US citizens, that last part is especially hard for me to tolerate.
I'm actually considering a visit back for the first time to see my ailing grandparents, and honestly I'm worried about re-entering because I frequently voice "radical" opinions online (though never violent). We'll see how it goes.
This assumes you can find a preferable country that will take you. Most of the world is as anti-immigrant (on average) as the US is. Unless you have a lot of money they can take through taxes, changing citizenship isn't always easy.
As soon as I save up enough money I'm moving to Iceland while I still can.