The entity with the least incentive to fully investigate HBS is, paradoxically... HBS itself... because questions have been raised about multiple other coauthors, the reputational and financial consequences and wrongful termination claims look set to run for a decade. Some have conjectured that whenever the full facts are finally disclosed, this scandal will take out the reputation of Harvard in general (not just HBS, or Behavioral Economics as a field, or priming), or all the Ivies, at least for business-school.
https://forbetterscience.com/2023/10/30/stephensons-alternat...
My institution completely brushed it off as a no problem, and said that it wasn't worth pursuing it at all.
It was very traumatising (and still is). I lost all faith in academia.
Alternatively maybe they were obligated to back them up if the work was done in their official capacity as faculty?
Sure, but if this were to become commonplace, you can see misconduct researchers becoming a target for big recurring legal defense bills, big enough to involve insurers, faculty funding, etc. Eventually we might a some landmark verdict like the Apple-vs-Samsung of misconduct/defamation trials.