What proof do you have that he is behind everything?
All we have is second and third hand information from characters biased against him.
We have 0 data about him trying to break existence. He wants power. What use is power without something to rule over?
Doc Scratch.He serves under Lord English, and by doing so, everything Doc Scratch has done, Lord English is behind.
Doc Scratch influenced Rose to activate the Tumor within a certain coordinate of the Furthest Ring.
Doc Scratch himself describes Fereri's Lusus as a
"gift", causing the Empress to seize power over the Troll Race, and subsequently end the race; causing her Imperious Condescension to enter under LE's services.
Doc Scratch stole Damara from her meteor, and trained her to be in his service.
Doc Scratch caused each of the terrible troll accidents(with the codes) through one measure or another, ensuring his own existence.
Doc Scratch, by telling Vriska to deal revenge upon Aradia, got Aradia to die; and thus allow Aradia to prototype both herself and the frog, causing the Black Queen to be exiled, causing both her enlistment under LE and Doc Scratch's Paradoxification.(this also allowed Sollux to create the copies of SGRUB)
Doc Scratch told Spades Slick to kill Snowman, to end a universe.
Doc Scratch told Rose to look into the Cueball, and become Grimdark.
Doc scratch, by extension of making the troll session what it is, allowed cancerous universe B to exist.