It may be the case that the babies died due to vulnerabilities of prematurity that the hospital, resources, consultants and nursing staff were inadequately able to cope with.
That parents may have brought medical negligence claims.
Finding a scapegoat increases parental distress but makes all culpability disappear.
There is no objective evidence of murder. The law does not proceed by finding a likely candidate for murder and then orchestrating circumstantial evidence so that a jury finds them guilty.
The guilty verdict may please the crowd but is a threat to justice. This is why it won't go away. It sets a dangerous precedent.