However, DHS was almost entirely formed from existing departments and agencies that were merely rehoused under a new structure, so Chesterton's Fence definitely

However, DHS was almost entirely formed from existing departments and agencies that were merely rehoused under a new structure, so Chesterton's Fence definitely applies to all of those. Even CISA, which is one of the newest elements, is now almost a decade old with a lot of accumulated expertise and experience.