Really enjoyed it, but what about the victims family?

First, it was Julie's car, wasn't. I thought it was she drank too much to drive so Robert drove. He wasn't loaded, but he was many hours without sleep and under tremendous pressure. He really wasn't in shape to drive either.

Second, why do you think Julie's mother should've been in more of the story than she was? She was really a throwaway character. Her scene could've ended up on the cutting room floor and the movie wouldn't have been the worse for it.

I got that the mother was grief-stricken. I'm sure the whole family was outraged that the driver of the car got away and their loved one died...so young and with so much promise. But why would she be angry at Robert? She didn't know Robert was the runaway driver. She didn't know he was her daughter's married lover. All she knew is Robert was the blessed angel who recognized Julie's talent and gave her a huge boost. He was her benefactor. Why would she direct any of her anger at Robert?

I can't understand what you think would have made the movie better with more scenes with Julie's mother? She was a totally peripheral character. The film is an action-suspense drama. Following some side arc with Julie's grieving family showing their outrage over Julie's death would've only slowed the film down badly and been an irrelevant snooze-Fest.

You're right...the movie is Robert's story. Julie's death was an unfortunate footnote in Robert's life, just as Julie herself was.