Leaving her alone with no medication is neglience at the very least.
It's my understanding she had never revealed contemplating injuring the children. She had clearly indicated doing harm to herself. And her violent outburst betrays the lack of competancy of those providing medical care to her.
He is a lay person. Smacking him down in the absense of charges to professionals providing medical care to the woman strikes me as amazingly wrong-headed. Hey, that's MO. Take care.