"Yet, many times in WXC I also came across IDs having suffered greatly from unloving parents. They would need to manage a different kind of pain. "
- Yes. It doesn't matter the quality of the relationship with one's parents before hand, the pain is almost always inevitable. If it was good before, you miss it and want to bring it back. If it wasn't, you experience the pain that you have never had it and now your last chance of getting it, however unlikely it is, is also dashed. There is also the lack of closure for people who have had unloving parents because most of them don't get an explanation as to why they were treated that way, so now they are left hanging with their parents gone, whether mentally or physically.