Except it's also telling that this is the subject matter they thought worth relating to him. "Look, isn't it amazing what we made the computer do?" To which Miy

Except it's also telling that this is the subject matter they thought worth relating to him. "Look, isn't it amazing what we made the computer do?" To which Miyazaki's reply is to (correctly) probe the content for meaning, not materiality. He's not objecting to horror or disgusting things per se, but pointing out there's no point without the humanist part as well. Their project is ultimately artless, regardless of topic, and they pick this to show him because they're too dumb to see that in the first place. It's a blatant transposition of solutionism into the realm of aesthetics - they are enamored with their magic box but have nothing to actually say.