My psych teacher has a poster in her classroom that says “Everytime you call your boyfriend ‘Daddy,’ Sigmund Freud’s ghost grows a little bit stronger,” and if that isn't threatening, then I don’t know what is.
if jack is tied to john's destructive impulses, spade's attempted stabbing of karkat gains a new dimension. attempting to defeat his self loathing with outward aggression... which actually bonds the two. and would that make bec noir's destruction of the troll universe a metaphor for... john trying to destroy/suppress his own psyche? the imp poster graffiti implies something like that