it depends, i know they will never die at launch because i spend too much time on (Working) escape towers, if it is a test flight i usually revert, even if they don't die. though i crashed my Kliper replica with jebediah in it and felt really bad... until i found out jebediah,bill and bob come back from the dead , though i killed jeddon Kerman in a accidental reentry with my orbital tug, THEN i felt really bad