On Sunday, a place of worship was turned into a scene of violence. 

In Grand Blanc, a former Marine and Iraq war veteran shot and killed at least four people at a Mormon church and allegedly set the building on fire. Officials say it was an act of targeted violence, though the motive remains unclear. Some victims are being treated at a local hospital. 

It’s no secret that gun violence is a big part of our culture here in the U.S. Gun deaths have increased over the last decade by 33 percent.

The United States is the rare wealthy nation with more guns than people.

Less than 14 hours before the attack in Michigan, another former Marine, Iraq war veteran and Purple Heart recipient killed three people and wounded five others in North Carolina. 

These stories are about guns and access, but they’re also about veterans reentering civilian life, about isolation, grievance, trauma, and how people respond—or don’t—to warning signs. 

Erin Comartin is a social work professor at Wayne State University. She spoke with Robyn Vincent about the roots of gun violence and how people can try to help prevent the next possible shooting.