Is there information that would jeopardize the case? Is there information of importance to national security?
If the bank robber had not been apprehended, the footage would have been released already ("help us catch him").
Even the Tampa teen and John Lihnd Walker had non-crime photos released (there is always a yearbook photo and driver's license even if the family doesn't want to share)
It's as much protection of ego as it is protection of the case. (I do the same thing in private life).
The goal of the media is to maximize revenue. Sometimes being stingy with details facilitates that objective.