It does not have to be that way. They could remain here as second class citizens without the benefits and without voting privileges. There are lots of options. Problem is, everyone gets emotional and knee jerk about it.
Fester. You're not being realistic. You talk almost as if you have never lived in the US and don't know any liberals and have never read the New York Times.
Things don't work that way here. If they are here, they are going to get everything. You should know that.