The Instagram video, posted on Sept. 9, begins abruptly. “We are aware of the pain that has been caused by the character letters we wrote on behalf of Danny Masterson,” a rumpled, unshaven Ashton Kutcher says, sitting beside his wife, Mila Kunis. Two days earlier, their former That ’70s Show costar, who’d been convicted of raping two women, had been sentenced to 30 years to life in prison, despite their pleas for mercy, which were made public on Sept. 8. “They were intended for the judge to read, um, and not to undermine the testimony of the victims or retraumatize them in any way. We would never want to do that,” Ashton, 45, intoned, before pausing briefly as Mila, 40, turned to look at him pointedly. “And we’re sorry if…