The mass shooting in Vegas, in Tasmania, in Norway, in New Zealand, etc?
As an objective fact (your words) extreme mass shootings are strongly correlated with race.
The rest seem more correlated with economic circumstances.
Mass shooters are not so impulsive. They are patient, focused, and inspired. There's usually a great personal or political motive. They plan, prepare, train, strategise. This is the White man's domain.
Imagine the terror of a people with the killing proclivity of blacks and the killing capacity of Whites!
You might be surprised by how many "White" mass shooters in the US are on prescription pills (almost all of them), or are in fact Jewish/Asian/Hispanic. The US media loves a White shooter, truth be damned.
According to Wikipedia, 4 of the 6 sources for definitions of mass shootings in America specifically exclude "gang" related shootings. https://en.wikipedia.org/wiki/List_of_mass_shootings_in_the_...
How convenient.
Unsurprisingly, then, if you break down the rate of homicide by firearm in the US by race, you see similar statistics. ie. European/White Americans have a rate that puts them among the safer European countries; African Americans are among the highest in the world.