What kind of parent just abandons their children? Of course their driven to such lengths - they've been left in a country with nothing, they've no opportunities to succeed in life. If a wall was on the border and they knew that their chances of getting in were about 5% instead of the current 95% that might change these parents and kids minds and convince them to stay at home and build up their own country
Probably desperate ones. That's why it's so sad.