Does this include protecting someone from suicide? How would are organization protect them from that without infringing on the whistleblower's liberty?
Yes, protection from suicides and "suicides" would be critical.
How to do that while preserving freedom is an open question. If the organization and its leaders have a genuine incentive in keeping the person safe, do you think there would be fewer deaths?
Over time, I have a feeling that a set of best practices would be developed for these situations.