The proper ending to that quote is: But what you can do for your country.
Beyond all the jabbering from this side and that, America has shown that it is more than able to change. If you are dissatisfied, don't move to Canada. Stay here, gather up a group, and try to change things.
It wasn't so long ago that I could have been legally fired for being gay. Now? I wear rainbow earrings to work, and if anyone gives me shit for it, I can sue them. I didn't fight for these rights, but small groups of very determined people worked for decades to give them to me. The ALCU, NAACP, and varieties of other organizations, now considered formidable in the public arena, had to start with someone seeing injustice, and resolving to do something about it. But I suspect that the majority here aren't really aching for a solution, or really bothered enough to initiate a movement.
People complain, that's how it is. If things were different, we would all still be here posting, just something different. I bet it would be the same people, complaining with the same intensity and passion, about an entirely different subject.