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I find it odd / hard to understand why the folk who seemed to see what could be happening didn’t call the police themselves
Aside from the threats to their careers, initially they were calling for a proper medical review, not criminal charges, because they knew they only had circumstantial evidence, however much it worried them. It's also worth remembering that a fair number of lives have been ruined by false accusations of murder with regard to child deaths because of "expert witnesses" not taking enough care with statistical analysis. Remember Sir Roy Meadow? If you don't, look him up.
They eventually went to the police not because they thought they had a strong case but because not enough was being done about the evidence they did have.
I find it odd / hard to understand why the folk who seemed to see what could be happening didn’t call the police themselves or at least escalate it to the regulatory / governing bodies when it looked like the management wouldn’t move fast enough on it.
Everything about the whole thing is horrendous and unreal.