@TrevorGoodchild Rowling makes use of the female superpower - instinctive understanding of personality - to engineer a plot twist very similar to what Rand pulls off in Atlas Shrugged.

When she finally explains Snape's backstory it all snaps into focus like the end of a Mamet play. Of course it's all in service of an incredibly vapid postwar morality play, with Voldemort the hypocritical mongrel wizardist and his corrupt aristocratic followers plotting normie genocide.