If I remember right there was an incident a week or two before this shooting where someone just stole a rifle right out of the store during business hours without anyone noticing....I think THAT prompted the initial probe, the newton thing was just icing on the cake...
following a 60-day period when the store owner could have appealed. The fact that he chose not to suggests that there may have been good reasons for the revocation, IMO.
I wouldn't rush to judgment, for all we know the ATF threatened to arrest the owner, throw him in jail, railroad him with every charge under the sun, SWAT his house while his family was home and shoot his dog if he appealed.
Lets wait and see what is released before trying to speculate exactly why the FFL was yanked.