From J. Robert Oppenheimer, leader of the Manhattan Project:
When you see something that is technically sweet, you go ahead and do it and argue about what to do about it only after you’ve had your technical success. That is the way it was with the atomic bomb.
Reminds me of a Patton Oswalt’s rant on old people child birth “We are Science. We’re all about could have, not should have” http://www.youtube.com/watch?v=5rGrsmvBHMw