To play devil's advocate: Let's say my morals aren't bothered by killing members of the Taliban / Al-Qaeda / Enemy Of The Week, as I consider them a bunch of fanatics and a threat to western civilization. As such, I work on guidance systems and weapons to try and improve their effectiveness and accuracy, making them more precise, and less likely to kill civilians and cause collateral damage when employed.

Now what? Where do you derive your morals, and what makes them inherently correct, and mine reprehensible?