Are you referring to our own borders?
Do you really think your going to kill all those that hate worldwide? Isn't going to happen friend.
Would it not make sense to protect ourselves here at home? We are so concerned about terrorism, yet hundreds of thousands enter this country illegally at will. Do you not see a slight discrepancy here? Our doors and windows are wide open.
If you have groups of people that are trying to kill your entire family, would you not lock your doors and windows to your home? Would you not do everything in your power to protect your home and family?
Or would you allow anyone to enter that happened by?