The Haitians that are coming over now were displaced by the 2010 earthquake that destroyed much of Haiti. They were not "gaming the system" when they ended up in the US. Get used to it. Migration, like climate change, will just get bigger and bigger in the future. A population explosion is occurring in Africa and other areas at the same time that climate change is slowly rendering large areas of the Earth as uninhabitable.  You may as well try to stop the rain.