It was Lewy Body Dementia. He had periods of lucidity and in one of those decided that he no longer wanted to live as a prisoner in his own body, and a burden to his family because for all intents and purposes his life as a functioning human was over.
Honestly his entire circumstance is a shining example of why we need a death with dignity law.
"Bon Jovi for Goth Dads" is the other one I enjoy. I love Ghost, Tobias writes exactly the music he wants. Not trying to be metal, he was heavily influenced by og heavy metal (Sabbath) and the theatrics of the glam/hair metal era (Kiss). Combine the two and ya, that's just Ghost.
It's very intentionally campy and fun, like year round Halloween.