So, Moral Laws Treat Different Bonds Differently

Back in evolutionary time, we didn't interact with others across the world; only with the people in our family, the people that we could see. It's because of that that we have developed these sorts of biases that have to do with social distance: we think that the harm that is being done up close and personal, right in front of us, matters more than the harm that is being done across an ocean.

So it shouldn't surprise us that the biases our minds exhibit are pragmatic. The moral judgments we make about people close to us are more forgiving and nuanced than the judgments we make of strangers.