It was, in some ways, an all too familiar set of circumstances. A shocking shooting followed by a near-instantaneous search for answers as to the motive, with people examining a message written on a bullet in hopes of understanding the situation. Similar to the assassination of Charlie Kirk just two weeks ago, a killing of at least one detainee at a U.S. Immigration and Customs Enforcement facility in Dallas, which also resulted in serious injuries to two other detainees, quickly generated a conflicting array of information and opinion on Wednesday. Federal authorities said that the shooter had opened fire from...