via Asha Rangappa:
If you read Mary Trump's book, you discover that in the Trump family, illness (including addiction) is seen as a *personal* failure -- it means you are weak, and don't have the "positive thinking" required to be a success. He lies about being ill bc to him it means you're a loser
For the same reason, he has to parade around and "prove" to everyone he's not ill (hence the videos, the ride around with Secret Service, etc.). Expect more theatrics to create the perception that he is totally fine, even if he isn't -- and even if it puts others at risk.