Allan:
He stared into an eclipse.
He claimed that the moon (Earth’s moon) was a part of Mars.
He claimed that we need global warming because New Yok was cold.
He bragged about passing a test used to evaluate dementia.
He repeatedly asked why we couldn’t just use nukes during foreign policy meetings.
He proposed injection people with disinfectant to cure Covid.
I could go on.
These examples are not made up, exaggerated, or taken out of context.
The answer is that he is not mentally astute now.