I don't get this "murder is bad" stuff here. Riker is murderer by profession: Starfleet expects him to kill the enemy. Yuta is the enemy, even if a sexist asshole from the 21st century might say that she has to be left alive because of her boobs and pretty smile.
"Agony is better than death"? What sort of reasoning is that? Riker is a murderer by profession. He is not a torturer.