How safe are drones?

There's been a lot of talk about throwing open American skies to drone traffic. Before expanding drone traffic we should look at some of the crashes of military drones. Since 2001, the U.S. military has had a problem with drones crashing around the world. More than 400 large U.S. military drones have crashed in major accidents around the world; that's more than two a month. 237 of these crashes destroyed the aircraft or caused at least $2 million in damage.