You are assuming people will "resee" it. But people need to have seen it for the first time somewhere in order for that to happen. A lot of people don't know this picture, or have idea what impact it has, and if Facebooks censorship remains unchallenged, a lot of important pictures will remain unseen by a growing proportion of people.

This specific people may escape that fate, as it's important enough to be in history books - I believe I first saw it in primary school - but handing Facebook the power to hide important parts of history from a huge proportion of people is dangerous.

> since the war photo is pointless

Those war photos are supposed to be reminders for future decisions.

Based on continuous USA policy to export war to foster weapon economy, not much has changed though.