In this case, the discussant correctly focused on ruling out an infectious cause for this acute, multisystem presentation of a disease in an otherwise healthy young man.
Criminal sociologist Rafaela Setti, in an article for Focus magazine, described why Leonardo might have genuinely believed that killing innocent women would protect her son.
And now that you know the physics involved, it should come as no surprise that John Quincy Adams conveniently placed his desk right on top of this leftmost focus point.