politicians are cowardly and do not want to go through the hassle of doing things like mass deportations when they know they'll have a lot of protests / media outrage / etc. it also means figuring out where all these people are, a lot of raids, political point scoring from the other side on top of it most people are sick of illegals and the system shouldn't be in the mess it is, it's going to take a lot of doing to turn it into a well oiled deportation machine.
Republican