In death, he has become famous as a cautionary tale about the risks of mindlessly following the armchair medical advice President Donald Trump has dispensed from the White House podium. But friends of 68-year-old Gary Lenius, the Arizona man who passed away last month from drinking a fish tank cleaner that contained an ingredient, chloroquine phosphate, that Trump had touted as a potential coronavirus cure, say they are still struggling to understand what drove an engineer with an extensive science background to do something so wildly out of character.