My point is that your hierarchy of moral reasoning necessitates subjective value judgements. The infant's morality is no better or worse than mine, absolutely.
There's really no such thing as subjectivity in the way you think of it. That is a relic of now discredited Cartesian philosophy. The rules of morality are not much different to many of the other rules we follow - for example rules to do with the use of words.
Of course there is doubt in some cases, and the system is incomplete - and that is where we start disagreeing. But that disagreement takes place in the face of massive agreement.
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