In this economy you already have more unemployed. We just have to make sure that the social services intended to help those Americans in time of need aren't being sucked up by a bunch of border-hopping bloodsuckers like they are now.
Oh, and why would you object to using the threat of capital punishment to deter invasion? It just might work. Whaddaya say? It could just inspire the invading sponges to do something to fix that rathole they're fleeing in droves.