Drones

The current dust-up over use of drones in the US to target US citizens bothers me a lot. Why? Because I cannot in good conscience agree that one standard is acceptable for treating US citizens while another applies to "ferenners". How can anyone look her/himself in the mirror and say, "well, if someone is about to attack the US Capitol in an act of terrorism, it's ok to kill that person if he/she is a non-US citizen, but you must hold your fire if that person is a US citizen"? It is not only ridiculous; it violates my fundamental sense of equal treatment under the law.