Do y'all wanna hear my bill lore theory? I think bill was a messianic religious-leader/revolutionary in his home dimensions. I think he led a (holy?) war against the established order. I think there was a whole matrix/dune thing going on srsly
He was king there. He preached. He divided the town. Probably between believers and non-believers. We know he has cult leader characteristics that he uses on earth. I think this is how he developed them:
It's not a stretch to say his society was probably oppressive authoritarian 1984 etc etc. It certainly discriminated against him for being a (excuse the term) 'free thinker', which they decried as 'heresy'. I think bill was awakening people to the reality of their society, matrix-style. But unfortunately, discontented, unstable societies are not always rational when picking their leaders.
Bill had the powers of foresight, dreamwalking and more, something genuinely supernatural, unexplainable. I think this was enough for the oppressed to not only choose him as their leader, but worship him as a god king. And I think there was a point where bill genuinely thought he could liberate them, that he was the chosen one.
The downtrodden fully trusted him, gave him unlimited power to defeat the evil and rot in society. And that just corrupted bill. I think he led a war for liberation that just ended up in mutually assured destruction - with bill being the only survivor. I think the fervent worship combined with failure to save his people made him the narcissistic nihilist we know today.
Ok some of this might be a stretch but you can't deny it's fun to think about.