I don't think I'd ever want to erase a memory no matter how bad, but then again I haven't been through some of the painful things that some of you have described. What I would ask for, is the strength and fortitude to be able to accept what has happened.
You read all the time about people with mental problems that are cured when a psychiatrist helps them to remember something traumatic that had happened to them, that their mind had unconsciously blocked out. Denial that something happened, no matter how bad, can't be good...