Yes. Punishment by death is not a option in many countries of the world so you should think twice before doing it in a game. However fighting and killing people is not an accepted behavior nearly anywhere so by this reasoning nobody should play those games, but we do and we realize the difference between playing and reality. That's what makes that question interesting. I did feel that execution to be different from in play killings, but exactly why? Only because years and years of training myself to think they are different? Don't know yet.