The New York Times recently featured the death of Ms. Shatzi Weisberger. This prominence was not because Ms. Weisberger was famous, but because she was a proponent of the “positive death movement,” which was started by people who wanted to break the taboos around discussing death. The movement has grown online as people gather for virtual “Death Cafes,” follow YouTubers like “Ask the Mortician,” and download apps like “We...