"Because she said she would donate the marrow and then reneged without the courtesy of explaining why."
No no, you are mistaken.
She reneged without giving US, the GENERAL PUBLIC the courtesy of explaining why. We have no idea what she and her family have previously discussed, we really have no particular right to know, and she's not under any obligation to go to the presses with her personal life.
As I mentioned before, she was not interviewed, and at no point in this article has a chance to give her side.
According to the article, the dying man's wife asked for a reason and all she said was she had to put her own family first. If there were more to it, the woman wouldn't have been at her door, begging.