LOS ANGELES—They have come from Colorado, New York state, Louisiana, and Indiana. Some days, they arrive at 4 a.m. or camp out in the rain to get a place in the courtroom. They sit in the gallery, watching the spectacle unfold while replaying the tragedy that brought them here.
For parents who have lost a child to what they say are the engineered harms of social media, a landmark jury trial that began on Feb. 9 in Los Angeles has been a roller coaster of emotion and a chance at validation, years in the making.





