The overwhelming evidence suggests the single largest common factor in all of these incidents is that all of the perpetrators were liberals.
LOL. you beat me to it.
I bet 90% of the crime in this country is directly attributable to liberals. No joke.
You beat ALL of us to it. I am willing to bet an indepth study of mass shootings would conclude that almost all of the shooters were liberal minded with little or no conservative values. Sane people typically don’t go around shooting people for the “fun of it” or randomly because they are having a bad day.