My use of "brutal" was mostly rhetorical, but there are indeed brutal aspects to our make-up (esp in sex), no?
I don't know if kids are naturally amoral -- I think there's a lack of cynicsm and self-delusion that afflicts many adults. But, yes, very young kids must be shown how to deal with others, so in that sense "morality," or to be more exact, socialization, is imposed from without. But without there being a natural human tendency toward kindness, cooperation and love, these lessons wouldn't take. Instead of grafting on morality, aren't we merely helping the young to tap what's already there?
DP