@captainmarvel4ever: To get the Corps as a whole to embrace the no kill law. Kyle has never been under that specific law because of his unique ring whereas Hal and Guy's killing had either been retconned or were just being ignored.
@captainmarvel4ever: Hal had killed Sinestro at least twice before then.Guy had attempted to kill Hal several times. Kyle decapitated Major Force. John attempted to kill Carol Ferris. The "no kill law" didn't Always exist.