Between the years of 2015 to 2019: Rifles of all kinds(semi, lever, bolt, pump, single) killed less people than hands and feet, or blunt objects.
https://www.fbi.gov/file-repository/active-shooter-incidents-in-the-us-2021-052422.pdf/view In 2021, there were 60 shootings identified by the FBI as active shooter incidents, excluding shootings caused by self-defense, gang violence, drug violence, domestic disputes, hostage situations, crossfire as byproduct of another crime, or actions that didn't appear to put others in peril. The vast majority of them, were committed with handguns.
Also if the AR-15 has no good purpose, what's your stance on the AR-10?
Not saying your stance is invalid, or we should do nothing, but why is the answer essentially to just ban things that look scary?