Rehtaeh Parsons was a victim of assault and revenge porn enacted and filmed by a bunch of teenaged boys who had more power than they might have ever imagined: they could kill from a distance. As Elizabeth Renzetti says of these double-barrel assaults, they are, "not just an act of violence but a spectator sport." And here we thought we had come so far from the bloodlust days of the Colosseum.
The act isn't dissimilar from torturing an animal and showing pictures to people. It's a behaviour that is absolutely depraved. Who looks at those types of visuals without looking differently at the goon who took them? Unfortunately, there's enough of an audience that we need to be afraid. For some people, their body responds to the visuals even if their brain might hope it didn't. So clips are saved and circulated endlessly.
Circulating the film is also a mean of re-shaming the act. After years of the rally cry, "Rape is a crime, not a shame!" some perpetrators are working hard to make people ashamed to be raped for obvious reason: if they're embarrassed by it, they won't tell. But Rehtaeh did tell.