There are some on the list I’ve never encountered before.
Karl Marx: “Go away! Last words are for fools who haven’t said enough!”
I dunno. He had only managed to fuck up half the world. Some deathbed words could have either fucked up the other half, or undone some of the damage.
Some better last words would have been:
“You know all that communist shit I wrote? I just did it to sell the books and get enough cash to buy all the cigars, booze and drugs I could possibly consume. So long, suckers!”

I don’t know that it was Old Major’s fault so much as Squealer and Napoleon.
Marx wrote about an economic theory.
Arguably Lenin and Stalin fucked shit up.
Look at where capitalism has lead us…
Sure, socialism is an economic theory, one that pervades just about every successful society to one degree or another.
Communism, on the other hand, is just a crazed, utopian ideology, political and social, not economic. A world without states, classes or any private ownership is, frankly, just the opium-addled dream of a madman, as Lenin was at least starting to grasp, but made the rather poor choice of death.