"They don't improve the US by physically living in it. They improve it (and the rest if the world) by being good citizens of every place they have influence. Including the internet."

Well-said! Very true, and sadly not recognized by many of the people still in the US. Or else, they don't care about improving it, or don't understand what it means to be a good citizen. (I'm afraid that last one may be true... just like so many people's understanding of "patriotism" now means "unquestioning obedience")