The rhetoric of "[Region X] is bad, so people should just leave there" isn't really helpful at all. It overlooks the many challenges that might keep people from leaving their homes. You could just as easily say the same thing about the people living in Yemen, or Detroit, or Palestine, or West Virginia, or Ukraine, or Florida. "If it's such a horrible place to live, then why don't the people there just leave?" Because it's really not that easy.