Sue, the best I could find for the Hemingway connection is not Ernest, but S.R. Hemingway, a researcher/scientist who was a coauthor of at least one paper on the toxic properties of the plant.
It is called devil's trumpet for a reason, and angel's trumpet as a screen, because when people first think of angels, they think of only the benign kind, whereas in theology, there are fallen angels. Perhaps this link and the author's take on datura might put things in perspective:
https://pixiecraft.wordpress.c...
There is a difference between having the courage to take a calculated risk, and the arrogance of recklessness.