It should have nothing to do with anything, but since background checks are the restriction du jour for the politicians to push, people showing examples of how guns sold without background checks are used in irresponsible ways would serve to support the fictitious "need" for such a measure to be codified.
It's directly in line with the usual PR BS that is being used these days to push unconstitutional legislation down our throats with a thin sugar coating.
The stench of troll does seem to be getting thicker.