Fighting between the military backed by Col. Muammar el-Qaddafi and rebel forces in Libya recently took the lives of two photojournalists: Tim Hetherington, co-director of the Afghanistan-war documentary “Restrepo,” and Chris Hondros, a photographer for Getty Images.

Hetherington and Hondros were known for their work documenting human rights issues by photographing images of war and suffering, so their presence...