And the idea that a theatre of people would give up a rousing cheer over the execution of a foe that's been rendered helpless makes me wonder just what they feel.
We don't have to bring ourselves down to the level of those we're fighting.
So, when you saw "Star Trek" (2009), and Nero got his comeuppance, your fellow cinema audience members all sat there, stunned, and murmuring, "Murderers! Murderers!"
If these same people watched Balance of Terror would they be calling for Kirk to blow away the Romulan Commander? His actions could have started a war that could have lead to the loss of a lot more than just Vulcan.
The point of that ep was that he was more of a noble savage, not a delusional, grief-stricken, vengeful whackjob like Nero.