Both of you are wrong, imho.
Any data gathered in an investigation into commercial carriage that involves Death or substantial commercial Loss must be made available to those involved, and to those who are affected, either directly or indirectly.
Some discretion with personal grief must be allowed for, when it is not directly appurtenant to the accident.
Commercial Carriage (Travel) is a CONTRACT. A CONTRACT that disallows disclosure of material bearing on the CONTRACT is not a legal CONTRACT.
Witholding pertinent material of any description that bears on the ability to perform, is a species of FRAUD. I purchase a Ticket (Contract) and I am not aware of the dangers inherent therein, by design, violates the DUTY of CARE implicit therein. This can be waived, by me, a right that is alienable, (removed). Disclosure is the foundation on which the contract reposes. Secrecy is for subjects, not citizens.