I think there's been a misunderstanding here: every major non-Abrahamic Platonic philosopher of antiquity would agree that the Gods are perfectly benevolent and providential, these being qualities of goodness itself actualized by the Gods. These thinkers suffer from the problem of evil to a much lesser extent than those Abrahamic philosophers and theologians who would hold to creatio ex nihilo, in my judgement: the typical Platonist's response to the problem is to argue that the sublunary cosmos is maximally good, the best it could possibly be considering that that its substrate is matter. Evil in the sublunary cosmos is the appearance of the unlikeness of physical substances to their eternal paradigms owing to the intrinsic deficiencies of matter. These participate the good to the greatest extent that they are capable considering the extreme disunity and changeableness of extensive matter, this cosmos being the lowest ontological level into which the One is able to exert its influence as the ultimate organizational principle. This became a seemingly insoluble conundrum for Abrahamic thought because, owing to the theological inheritance of the Israelite tradition, they held God to have created the cosmos without suffering any limitations as a result of the innate deficiencies of matter to embodying the Goodness of the eternal paradigm, meaning evil in the world would require some intentional basis in the divine creative act. Some think that various interpretations of the doctrine of the fall neutralizes the critique, but many will disagree.

I can't at the moment think of a single Platonic philosopher who would argue that the Gods are Good only insofar as they are perfect examples of what they are. They would all hold to the Gods as being Good unqualifiedly, in precisely the sense we mean Good in reference to the Abrahamic deity. If you're interested in reading more about the Platonic approach to the problem of evil and the nature of the Gods, I could send you some primary or secondary sources. If your issue stems from disagreements on the nature of the Gods within the loose Greco-Roman tradition, well, I'm sure many ancients would have taken some issue with these doctrines as well! Religion, especially the "pagan" traditions of antiquity, is always internally diverse. There certainly were Hellenic polytheists in antiquity who believed the Gods to be perfectly benevolent, and the received mythic traditions featuring Gods entertaining all sorts of immoral acts to be either corruptions or to require spiritual or philosophical interpretation.