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It is painful to grasp, but mass shootings have become a common occurrence in the United States.

Whether at a school, a church or synagogue, or a supermarket, these incidents may shock,

but they no longer surprise. Cities, small towns, and schools across the country are now associated forever with this form of violence, names like Columbine, Sandy Hook, Parkland, and Euvaldi, Aurora,

Charleston, Boulder, and Buffalo. Each time politicians spar

over whether to blame guns, mental illness, or moral decay for the massacres. Against this backdrop,

it's easy to feel hopeless and to think that mass shootings have simply become an unavoidable

part of American life. But according to some researchers, there is hope.

By studying what drives mass shooters, they say,

we can better understand the causes of America's mass shooting epidemic

and perhaps learn how to stop it.

What drives most mass shooters?

What do they have in common? What role, if any, does mental

illness play in their actions? What about racist and extremist ideologies? What about the internet?

Does media coverage of mass shootings drive copycat crimes? Do active shooter, and armed guards at schools save lives,

...