Sanitising war makes war more likely, as it results in large portions of the public being inadequately informed about the full consequences of war. It is also disrespectful to service members who made profound scarifies for their country, and deserve to have their stories told in full. A healthy democracy can only exist if citizens are informed by a free and fair press.
As the saying goes, "those who don't learn history are doomed to repeat it." The photos may contain disturbing images, and people viewing them should be warned, but the photos can be used to help civilians understand some of the horrors of war, and educate the public on the dangers of getting unnecessarily involved in conflicts.
With the advancement of the Internet and the easy access to news and pictures, much of the reading and viewing public have become numb to the everyday images that traverse the web. The reality of the Civil War was that it was brutal in nature. Hiding that fact from the public does not change history.
Photos taken during war that contain mild violence be shared with the public because the public needs to know what happens or happened during a war. In the case of the Civil War, these photos are historical and important for understanding history. In the case of modern wars, the public needs to know what is happening. Those who do not want to see the violence can simply choose not to view the photos, but photos should be available for people who want to see them.