One thing that’s so great about Homestuck is that the main problems don’t originate from anywhere, it’s a causal time loop.

I mean, you can trace most things back to English, while also being enforced by a few other bunch of selfish characters. Gamzee seems to be a specially huge source of trouble, having been the one to allow Jack to Ascend, and having made Cal materialize in Dave’s Dream Room. Of course you could always argue that even without Gamzee, the Universe was still Cancerous and bound to die- But it was only Cancerous because the Session lacked the Last Frog, which Kanaya didn’t see because Doc Scratch was the one who woke her up- Again, ultimately, it comes back to a servant/part of Lord English.