I am American, but have lived abroad quite a long time. My experience is a corollary to yours.
Even in the poorest countries I have been to - normal people do not want to leave their homes, to break the law in the United States. Normal people worry about their parents, children, brothers and sisters and don’t abandon their families. Normal people in even the poorest countries do the best to live a normal life at home. Normal people even in the poorest countries do not want to be stateless or live in the shadows of another country. In sum - NORMAL PEOPLE DO NOT BECOME ILLEGAL MIGRANTS. ONLY ABNORMAL PEOPLE AND CRIMINALS DO.
It sounds like your wife’s relatives are much like liberals here. They are fairly successful in their country and support the “poor huddled masses” just to virtue signal and feel good about their “caring” selves.
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I would challenge you on that. Their situation is so bad, and to a large extent, we have left the door of opportunity open. Remember when I said there are no consequences? That is real. These are very normal people responding to the path of least resistance and casting lots with Uncle Sugar.
Bears repeating