I can imagine they leave home to escape poverty, war, violence, persecution, lack of opportunities....People are entitled to search for a better life for themselves and a safer life for their kids. If I was unfortunate to be born in one of these desperate countries I would be doing exactly the same. What they are escaping from must be pretty bad if they are prepared to take their families across open deserts and treacherous seas in the desperate search for some light at the end of the tunnel.
Your lack of empathy with some of the worlds most vulnerable people reflects your upbringing and standard of education which in its self is very sad.