It's something I agree with Septic on. Such people can't grasp the concept of how good we actually have it here. They have an idea, a dream if you would, for a better life, but they can't grasp the depth of the "wealth" America offers. Wealth is more than just money.
Paved roads even to the smallest of towns? Unheard of in a lot of those places.
Grocery stores that typically (barring a hurricane) don't run out of food? It's as alien an idea as not having it would be to us.
Cops and government officials that don't require you to slap money in their hands in order to start an inquiry? A foreign concept (no pun intended)
Just the start and you get the idea. Wealth is a state of mind.