Just old and bitter?
Citizens are allowed to vote. For the sake of this argument, lets leave out the actual process of voting. Citizens elect official.
Citizens are NOT consulted for major decisions post election of said official. Citizens can bluff and buster all they want. Elected official can do as they please.
Lobby groups have more access to decision making process than citizens, and way more pull as they control the purse strings to re-election and keeping elected official with a job.
Therefore, I posit that it is simply naive to think "citizens" could demand the US to retreat from Europe anymore than they could demand an invasion of Europe. The world simply doesn't work that way. I am not saying it can't... it is going to take a whole lot more than electing Bernie Sanders or Donald Trump or Hillary or some horrible clown to get the power into the hands of the Citizens.
The bigger question(s) are; has power EVER been truly in the hands of the masses/citizens? Why do people cling on to that as a good way forward? Leadership by committee in my experience has been horrible beyond reproach...
So, yes, citizens could stand to wake up, I agree.
That is not how the world works at this time. "Citizens" are here to provide work for the state. Voting is illusory and until the masses wake up (not holding my breath), it will remain the case.