Nice post, except I have to disagree with this part:
“......knows it irrevocably stains the soul.”
IMHO that is not a universal truth. Some people are natural killers.
...Some people are natural killers.
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Yeah, you’re right. Luckily, the ones I know aren’t. I do think, for most people, killing has a negative impact on them.
Doesn’t mean they can’t/won’t do it again, if necessary, just that it leaves a mark.