> If we're going to use pre-determination as a defense, technically nobody within the original webcomic has ever done anything wrong.

the reason the argument works with vriska creating bec noir and not with anyone else is because bec noirs existence was already known about, so if she didn't do it she would have likely just created a doomed timeline. he was already There at the victory platform antagonizing the trolls, his existence was a known variable. with anyone else, its more people doing actions and the universe retroactively validating them as the "correct" actions. like gamzee killing nepeta and equius was seemingly predestined, but he didn't know that, he just chose to do it anyway, and the universe validated his choice.