Ipso facto means "by that very fact"

Maybe being a zombie is really awesome and they just want us to feel the same joy they do.

>This is the same debate that happens in the Matrix universe. Is it better to live in dumb bliss or experience the miserable truth?

Reminds me something from Hitchhiker's Guide.

>Oglaroon is a large forest planet. The entire intelligent population of the planet lives in one small nut tree. They partake in the smaller version of life, and some speculate other life exists on other nut trees. These 'heretics' are thrown out of the tree. Most dwellers agree any other trees are merely an illusion brought on by eating too many Oglanuts. When one of the dwellers dies, they are strapped to one of the less accessible outer branches of the tree. All beings are guilty of the same small-mindedness to some extent.

Maybe. I think this question is the whole point of the novel.