It is meaningless to reward a crew while the investigation is going on and any smart pilot will understand why.
The only benefit is for BA's public relations. The message received by the public is that BA's crews are heroes and that you should go for this airline if you want a safe flight (while there is still absolutely no official conclusions related to the causes of the accident...)
That's a great marketing operation that is not only cleaning up the company's image but also promoting it. Well done (to the
PR guys).