We don't know any of the details regarding the Irish remains, so theories are not very helpful at present.

Don't forget it's only a few years since UK hospitals disposed of stillborn babies in ways that were quite immoral.
Kept them in jars I believe, or disposed of them without the permission of the mothers.

I n saying that, the Catholic Church does have questions to answer, both over the sexual abuse of boys and young men by adult men and their historic attitude to unmarried mothers and their children.