The role of journalism in a report like this isn't to effect the arrest
or apprehension of those breaking the law. It is to expose the law
breaking.
Journalists enjoy a privilege called "confidentiality of sources" and
are not required to identify the people in the report. That's why their
images are blurred.
If this is as common as depicted, why has BATF not put a few
undercover folks in there and sent some sellers to jail? That would
surely make the news. Might even help the problem of too many guns out
there.