I really like this reading, although a lot of murder stuck was caused by jack's influence; with Vriska being killed by Terezi to stop her from going to fight jack, and Eridan killing Feferi before being killed by Kanaya because he was going to join jack. Tavaros was killed because of his attempts at revenge, so the reading works for this one. Gamzee killed Eqiuis and Nepeta because he saw an icp video, which is really random. the tragedy narrative is definitely a factor, with jacks influence if anything making them even more violent towards each other because they are almost certainly doomed, along with the revenge plot.