Jesus, some people are so uptight about sex that they lose all mental balance and start brooding about gratuitousness or whatnot, instead of absorbing the material, keeping attention to details and letting it sink in. Rage breakouts like 'zomg rape bad' are laughable in the broader context of the manga.
Regarding the chapter itself, masterful storytelling. In an earlier chapter it read: 'when suffering so profound as to make someone rip himself apart is confronted, a heart is frozen'. What's left in Griffith are malice and longing for power. Hats off, Miura's genius.