People know he is demented. What they don't observe, except those with him 24/7 are his delusions (believing something that is untrue and can be proven untrue to a rational person.) or his hallucinations, (like seeing there are a bunch of wild deer grazing on the white house lawn).
In the long run those types of delusions and hallucinations will leak out.
His caretakers have to get Biden out of there before he goes farther downhill and believes, based on imagined recent intelligence we are going to be attacked by China, and must strike first to reduce our casualties. Get me that nuclear football NOW! -Tom
Sum ting Wong!