LAST YEAR, Emma Alda, 38, of Fort Lauderdale, FL, saw a Facebook photo of her brother, Christopher, and some friends huddled, maskless, around a campfire. When Emma commented “Where is your mask?” Christopher unfriended her. “There was no discussing anything with him if your views differed from his,” she says, and his aligned with a widespread conspiracy theory: that the media and the medical community were exaggerating the danger of COVID-19, that masks and social distancing weren’t necessary, and that people who followed the rules were “sheep,” says Emma.
By December, Christopher, 43, had re-friended her, and Emma read several posts in which he mentioned how terrible he’d been feeling—and then that he was in the hospital with COVID. After three days on a ventilator, Christopher died. “My brother was a…
