I know this is pedantic, but you got me curious so I went to check the numbers.
Odds of death in mass shooting (US only): 1 in 11,125
Odds of death by lightning strike (US only): 1 in 161,831
So it seems that it's actually a lot more likely for an American to die in a mass shooting than it is for us to die in lightning strikes.
Edit:
Sorry. The source was the National Safety Council, National Center for Health Statistics, and the Cato Institute.
https://www.businessinsider.com/mass-shooting-gun-statistics...