I wasn't serious. Come back when you are in touch with your humorous side. They could practice by using them to spot illegal immigrants for the Border Patrol. That might make too much sense though. For the record, I don't actually think that "crossers" as you call them, should be killed. I think they should be deterred and the violent criminals among them should be arrested and prosecuted.
I've seen that very sentiment seriously posted on this site WAY to many times to think it was funny.