In his Reflections on the Guillotine, Albert Camus argues that every government that wants to maintain the death penalty should have to conduct all of their executions in public. Indeed, they should broadcast footage of the state murder as widely as possible.
He argues this because, in the absence of it, the public has no window into what actually happens in the death chamber. This allows the authorities to draw a veil of decorum over the whole hideous proceeding. As Arthur Koestler observes, in his Reflections on Hanging, the officials and the newspapers can talk about the execution in somber tones afterwards, leaving us to believe that all was transacted with the utmost calm and respect.