While I respect your thoughts on safety, we don't have runways swept or inspected before every departure. That's completely irrational. No one saw or reported the part that fell off the Continental jet in broad daylight that doomed the Concorde. I agree with the other poster that doing your own sweep at night at an non-towered airport also presents a major risk that most likely would be greater than not checking the runway for FOD. Again, I understand where your head was at but I also understand why the FO reacted the way he did.