Hanlon's Razor seems to fit too well IMHO. Assuming malice is a hard one to swallow when the evidence of bad decision-making is everywhere to see. To be on purpose for example you would have to assume that the hordes of people inside and outside the administration and the media all conspired to cover up Biden's deteriorating state, with the knowledge (or high probability) that he would lose in the first debate and step down without giving Harris enough time (or whatever theory you believe to explain why she lost). Just that portion alone is quite hard to believe IMHO.

"not a thing comes to mind!"