Saryn, even as a grey mage, had a hard time dealing with the backlash from killing people with order/chaos. Rahl didn’t seem to have the same issues – he was nauseous but not blinded or frozen in the same way Kharl or Creslin were, even when he killed large numbers of people. What’s different about him?

Rahl isn’t innately as sensitive to people’s feelings. His whole journey involves, among other things, learning to perceive and feel more beyond himself.