When your island is 'sinking' you make plans to get the heck off of it! And you don't need a government's help to do that.
Buddy, if traveling across international borders during hard times seems easy to you, it's probably because your passport and entire lifestyle is shockingly subsidized by a government so massive we literally call it a "superpower."
...
As for social and economic advantages, what are those? Sorry but I certainly haven't seen them. I bust my butt for every penny I earn and the feds try to take nearly half of it! I didn't choose to be born in the United States, just as no one chooses to be born in Kiribati, but I assure you if I were born in an abjectly poor area and had no other alternative but my own two feet I'd be out of there. The government thinks they own me but I am a free man and do not need their permission to leave.
Your entire quote is an example of that social and economic advantage, dude. You were born in a country that engages in ridiculous international interventions that result in practically no abject poverty (like, third world, where your family dies of hunger, parasites, or war) and gives its citizens visas on-demand in most major countries.
Allow me to explain: if you're born in most of the world, you cannot legally enter other countries without demonstrating significant financial assets and going through a complicated application process and background checks. So even educated middle-class people can't follow the laws, because the laws are designed to stop them from traveling.
(On the other hand, even a homeless, disheveled, half-braindead American can travel the world for the cost of a TV and not be arrested at the border. Amazingly, we even have words like "backpacking," which is when broke, jobless American college kids vagabond through other people's countries without even getting arrested or raped.)
If you do enter illegally, you're at significant risk of violence, exploitation, or incarceration, as well as death during the border crossings themselves. Even in the US, we imprison small children fleeing violence and pretend that they're competent to defend themselves alone in court proceedings in a foreign language.
http://www.npr.org/2014/08/14/340118824/young-migrants-may-request-asylum-but-its-hard-to-getAnd if there's an emergency, like a famine or war, that forces many of you to evacuate your country all at once, you can be captured by soldiers by the tens of thousands and put into concentration camps, where you and your descendants will be held at gunpoint because no government cares enough to vouch for you. Here's a picture of such a camp:
http://www.borgenmagazine.com/wp-content/uploads/2014/06/10-Largest-refugee-camps.jpgThought exercise: If you were suddenly caught by soldiers during a border crossing and thrown into a tent city, what would you say? If it sounds anything like "I have rights, I'm an American," then that's your social and economic advantage right there. Try saying, "I have rights, I'm Sudanese" and see what happens.
All of these people, the imprisoned children, the people trapped at gunpoint for decades, the people working menial labor under threat of deportation, the poor people who can't afford to travel but are having their nations sink, the people fleeing famines caused by droughts, are refugees.
You may be a survivor, but thanks to your giant government subsidy, you'll probably never be a refugee. So be grateful.