As a defamation trial between actor Johnny Depp and his ex-wife actor Amber Heard continues in Fairfax, Va., the headline-making case is raising awareness of domestic violence, as the two accuse one another of abuse. It’s too soon to tell where the trial will fit in the history of the subject, but experts who study domestic violence say the lawsuit has the potential to help shape the national and global conversation about abuse—just as a number of high-profile incidents have done before. The modern history of that evolution begins with O.J.