I found the segment to be really fascinating.
It showed an "upstanding" NY citizen confessing to multiple straw purchase violations, multiple violations on the prohibition of illegally exporting firearms, and other violations of the law I can't even recall off the top of my head.
It showed a former high-ranking ATF official who certainly could have made a call to current active agents and told them they had a major felon right there in the studio.
It showed the author of a book who had first-hand knowledge that this upstanding citizen had committed hundreds of serious felonies, but did nothing to alert authorities. Doesn't that constitute being an accomplice?
If 60 Minutes had disguised the faces of these three, maybe they could argue about the need to protect sources. But they didn't.
Where's the ATF? This isn't exactly a trail of breadcrumbs.