It's a weird internet-meme that the monster is innocent. Internet-dwellers have been posting that 2018 tweet as confirmation, as though that supercedes the text.

But it is true that I am a wretch. I have murdered the lovely and the helpless; I have strangled the innocent as they slept and grasped to death his throat who never injured me or any other living thing. I have devoted my creator, the select specimen of all that is worthy of love and admiration among men, to misery; I have pursued him even to that irremediable ruin. There he lies, white and cold in death. You hate me, but your abhorrence cannot equal that with which I regard myself.