Sentence:  But if <WSD>discrimen</WSD> is a cardinal virtue of adulthood, the tenets of infantilism work against it. <WSD>Discrimen</WSD> requires right judgement; but the idea of something, even judgment, being 'right', is in profound conflict with individualism (which says I can only claim my judgement as being right for me). 
Meaning of the word marked with <WSD> tags:  A pattern or organizing principle that forms the basis of moral judgements.