Based on... What? Biden has cancer. The convenient narrative that he was diagnosed after he left the White House holds about as much water as no one ever having died at a Disney theme park.
Cancer-fighting drugs do all sorts of whacky shit to bodies and minds. The conspiracy to keep the truth from the public was, I speculate, to avoid the inevitable pressure to have Biden step down and Harris assume the Presidency. Based on Biden's comments I have little doubt this was a selfish decision based on hubris that was championed and enabled by the establishment et al. Not that Harris would've been the People's President but at least she'd have been capable of actually leading.
I don't disagree woth you. Neither Biden nor Trump were / are fit for the roles they assumed. The dementia angle was weak Republican propaganda though and repeating it just keeps us further from the truth the public deserves.
Well, two, actually.