There's also the point that after a murder, the victim doesn't have to live with it. Very few people see death as a good or welcome thing, but it's still a widespread opinion that after death there's either a) paradise b) some other extreme change of existence or c) oblivion. None of which involve pain or healing or the many issues that come along with rape.
Naturally after murder the people around the victim go through a lot of bad times, but friends-of-victims are never the first considered in abuser/abused situations.