Once again Americans are grieving over lives lost to another mass shooting. On Monday, 10 people, including a police officer, were killed at a Boulder, Colorado, King Soopers grocery store. Just six days ago, we began mourning the deaths of the eight women killed in Atlanta.Once again Americans are grieving over lives lost to another mass shooting. On Monday, 10 people, including a police officer, were killed at a Boulder, Colorado, King Soopers grocery store. Just six days ago, we began mourning the deaths of the eight women killed in Atlanta.