The idea of reincarnation should never be used as an excuse to do wrong anymore than Christian forgiveness should allow a criminal to repeat his crimes or for society to not get its due.
Neither should 'she asked for...' be an excuse for crimes against women and children.
Clark's actions in ATAI were poorly thought out and callous. He took advantage of Lois's feelings for him and her trust in Superman.
Had Lois died, it should have killed Superman as well, if not literally, then figuratively. His actions proved he was untrustworthy and the world would not have been able to tolerate that - Trask would have been proven right. Aliens are bad for Planet Earth.
