Because they aren’t mass shootings?
“Because they aren’t mass shootings?”
Probably more due to concern about ‘stigmatizing’ certain types of people who actually do most of these mass shootings.
That would not be the correct answer.
"Mass shootings" as most recently defined by the FBI is an incident with 4 or more victims injured or killed by firearms. All of the incidents in the downloaded file meet this filter.
Yes, the FBI has changed the definition of "Mass shootings" several times. 4 victims is what they are going with at the moment. Pick any threshold you want and try again. There have been more incidents than you would expect.
One thing that stands out in the selected data is that in most of the incidents, the victims and the shooters are Black or Hispanic.
One might quickly develop the theory that most of these incidents get little exposure in the national news media because they do not fit the preferred Liberal narratives.
By definition, they are.