Rule #67 - Clark has his own set of "rules" (code, creed, whatever) that he lives by:
#67a - Thou shall not kill a human (no matter how much they deserve it).
#67b - Thou shall not harm a human (no matter how much they deserve it).
#67c - Thou shall be honest (unless trying to hide one's secret identity, especially from anyone named Lois).
#67d - Thou shall follow the laws of the land (unless working with Lois on an investigative reporting assignment).