User blog comment:Western Gen/Speculations for Season 12/@comment-24917665-20140923040721/@comment-173.58.251.107-20140923054308

Because it is proper villain manners to always explain how they performed their plans to the hero in order to give the audience (specifically the more unobservant ones) the full explaination as to their actions, which gives the hero the time to perform the heroic actions that then let them win.