The data on mass killings:

Mass shootings are no more common than they have been in past decades, despite the impression given by the media.

In fact, the high point for mass killings in the U.S. was 1929, according to criminologist Grant Duwe of the Minnesota Department of Corrections.

Incidents of mass murder in the U.S. declined from 42 in the 1990s to 26 in the first decade of this century.