I'm wondering what surprises you about this. Have you ever seen someone actually being comforted over the loss of a loved one? I mean actually comforted, and supported? Not just, "you'll see them in the new system. I think of all the married people who have been supposedly comforted by being told this. When my husband's mother died and Witnesses were going through the line to give their "condolences", one after another kept asking him about the weather of the new city we had moved to. Nothing about his loss, nothing about the person she was. At one point someone kept asking question after question about where we had moved to that my husband finally told him the reason that he was there was because of his mom's death, and the brother (elder) didn't know what to say and so walked away. My husband's cousin (another elder) didn't say one word to him the whole time, no "I'm sorry for your loss", not even hello. There was no fall out between these two, and my husband was in good standing.
Even if these Witnesses rearranged there DC plans to be with the parents, of what comfort and help would they be?