I think that the reality is that we are not really that smart, as a species. It is very hard to imagine those 9 people saved, when you see an actual child in front of you that will suffer from your decision to preserve lifes of others. If you see someone and know them it is much harder to decide to sacrifice them for higher number of anonymous people.
I believe our morality is natural (to some extent) to increase our chance of survival. And for that reason also we favour to save those more similar to us and closer to us…
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