"...before we leave Risa, if I can." Kirk said very softly, his eyes closing. "So that it's dealt with before everyone comes back to the ship. I almost want to lie, say that he is Starfleet's problem instead of ours." His shoulders slumped slightly; this was not something he wanted to do. Taking a man's life, no matter the danger the man faced....

Killing someone took part of the person doing it, if the person had any morals.