I don't think parent described 'frothing at the mouth', and furthermore the concept of "I shouldn't speak out otherwise I may paint myself as a target for child protective services" is so subversive and nu-speak like that I don't think I can ever support it. CPS is supposed to be a social service for the support of children; not a society control and opinion-steering organization.
If parent did something publicly that'd warrant the visit, sure; but creating public awareness of the situation for the parents can be done in an orderly and respectful way -- no one suggested otherwise.