For the same reason that if you found yourself with access to someone's diary that you thought might be guilty of wrongdoing, you might convince yourself to loo

For the same reason that if you found yourself with access to someone's diary that you thought might be guilty of wrongdoing, you might convince yourself to look through it possibly with a lawyer friend and report on if anything illegal went on, but you might shy away from publishing the whole thing online "just in case". One option at least pays lip service to legal and ethical considerations.