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Not necessarily to the public though.

Perhaps a more apt analogy would be your house is burgled while you are away, do the authorities have an obligation to tell everyone in the neighborhood or just you?

Did the burglarized house contain copies of the keys of all their neighbors? We're abusing the metaphor by now, but there's clear interest of the clients of the companies in the matter...

Abusing the analogy: instead of a house you have apartments and the burglar broke in to the building and now might have access to the other tenants' homes, don't you have to report that to the landlord, police AND your neighbors?

Still, are you going to place a majority of the blame on the victim or the burglar? It would seem that a majority of the blame lies with China if the allegations are true (I suspect they are)

It is basically impossible to track the source of a hack. China might just as likely never had anything to do with any attack so far.

Not every hack are related to your personal data.

Only to law-enforcement. Not to the public.