There’s an extensive Wikipedia article outlining known facts and atrocities - dumping the bodies is probably the least atrocious thing they’ve done.
EDIT: I believe OP is trying to distract from the atrocities by focussing on a minor one and misquoting Snopes.
Actually it was a place that harmed, neglected and even tortured children.
"There can be no Justice without redress for survivors and that redress must be paid for by Religious Orders who have harvested enormous wealth by inflicting misery and death on the most vulnerable in our society.
There can be no Justice without an Inquest into the dead of Tuam. They died horribly and unnecessarily. They had no life as children. The State owes them the dignity of an Inquest and a Death Certificate that truly shows why they died.
There can be no more betrayals of our dead children."
Source: Tuam Home Survivors
Also check out the Wikipedia article. The investigations and excavations are ongoing, so there will be proof of even more atrocities uncovered.