Some here some to misinterpret what is the legal obligation of the regulator vs that of the operator.
The direct duty of care towards air travellers lies with the operator. That is enshrined in the regulations you are bound to follow when offering airline services.
Therefore, the regulator has a 'duty of care' only to ensure the airlines operating under their licenses are following the rules, including rendering duty of care as stipulated in the regulations.
It's the airline who have an obligation to offer support directly to anyone involved in an incident, just as e.g. a train operator would be. If the operator does not live up to all of their responsibilities, it is up to the regulatory agency to beat them into shape, ultimately by curtailing or withdrawing their operating license if they refuse to follow the regulations. But it is never the job of the regulator to offer duty of care to passengers in any direct sense.