I wonder how much of his dementia is drug induced, even if the damage is permanent.
There was a power play in there, folks, where he seriously underperformed at the debates, even for him, and it was used as the excuse to bypass a primary election and install Kamala, a d*psh*t puppet as the candidate. (Ironically, even as the Democrats howled about threats to 'democracy'.)
The people behind the scenes either pumped him up or juiced him down and did so mercilessly for their own ends.
Not that he was not likely willing, considering his history of corruption dating back to his Senate days (going by the age of the documents he had that he was not supposed to have a copy of, likely information sold to the highest bidder.)