Don't forget that John Walsh and Marc Klaas were not dealing with the double whammy of having their loved one killed by another loved one.You handle it be accepting the truth, grieving and moving on - hopefully doing something positive with the grief, ala John Walsh or Marc Klaas. As long as they stay in denial, they will never get on with their lives and will be bitter, hateful people. imo
That throws a whole new dimension on it and I hope they are able to do something positive with this at some point. But they would be hard pressed to turn this into a positive at this juncture. That is a tall order.