> I fail to see how that is better

There was never a question about the comparative effect on the victims. The issue is that execution and murder are different. Replacing one term with the other as if they are interchangeable is dishonest. Specifically, this tactic is posed to evoke an emotional reaction and implies the victim was targeted specifically.

I don't actually need to explain this to you, as you already know it, but (often paired with ncmncm) disregard it in some perverse trolling exercise.