In the Galactic worlds, Intelligences exist within Group Mind Collectives. Choices and made by consensus. Because of the critical needs of the Earth Mission to identify any Outsider energy before it morphed or hid, the Law of Free Agency, independent choice, was put in place for the Mission.
The power to call in change and removal does not require masses. It depends on ONE who remembers the Mission, senses the "off" energy of the Outsiders and Calls in All the Forces of the Unseen to Remove the Outsiders back to their Homes of Origin.
Of course, the more there are "pulling" weeds, the faster the garden is cleared...