The constitution states that the people should always remain as powerful with their weapons as the government. It was written at a time when large weaponry like that didn't exist, but it doesn't state anywhere that the people shouldn't own weaponry like that. The purpose of the 2nd ammendment is to fight any rulers who might become too powerful and tyrranical; it's to fight tyrants and tyranny. The reason the 2nd ammendment is under attack is to suppress the people's ability to fight back against said tyranny, and when your right to defend yourself is taken away from you, chances are you're being ruled by people who don't have your best interests and safety at heart. So yes, at current, because the 2nd ammendment is under siege, the American people are, in part, "screwed". It's how the United States even gained their independence in the first place: by making sure the people were just as well armed for war as their overlords.
I'm British by the way.

"He who sacrifices freedom for security deserves neither."