Ok, so for you, the only reason not to smash someone or otherwise harm them is simply to keep yourself safer.
No, not for *me*. Animal behaviour has evolved through pack mentality, tribe mentality, etc, bringing with it altruism and other socially benevolent features - all in the name of survival. *I* simply feel compassion, empathy, love, etc. Knowing where these feelings come from does not make them any less real, nor any less worth acting upon.
Edited by cavediver, : Nor, not or