An ancient organization is a powerful cult devoted to Tsathoggua and operates as a shadow government behind the world's institutions. It's network of power has inflitrated administrative agencies, bureaucracies, armed forces, social authorities, and other organs of state in various nations in pursuit of its own agenda: to free the Sleeper of N'kai from its eternal prison. The cult is responsible for the majority of world events that have led to mass death. The spread of the Black Plague in medieval Europe, The Taipend Rebellion in China, the rise of Nazi Germany and the Holocaust, etc., were all set in motion by the cult to accomplish their task. The current tragedy resulting from their actions is a pandemic that has swept the world, shutting down countries and wrecking entire economies.
The purpose of instigating these events is to destroy the magical ward separating our world from the realm of the Outer God. This ward is made up of seven seals which holds reality together and keeps it from shattering. A violent act of murder releases a backlash of negative energy in our reality. One of these is small and inconsequential, and does minuscule damage. However, a significant event that leads to massive casualties, such as a war or a genocide, creates a significant amount of negative energy that causes ripples in reality itself. This energy builds up to a crescendo which permanently damages the ward, leading to the breaking of a seal. With each breaking of a seal, the ward becomes weaker until it completely cracks, allowing the Outer God to enter our dimension.
Since the breaking of these seals requires the release of negative energy, it makes sense for the cult to keep the world in a state of perpetual warfare, such as how it was in the ancient world and medieval period. The more death resulting from violence within or between countries, the more fragile the ward becomes. This would speed up its dissolution, allowing the organization to achieve their goals much faster. However, with every breaking of a seal, there is a "cooling off" process before the next seal can be broken. This allows the world to heal and recover from the damage inflicted, such as the reconstruction efforts made after WW2 in Europe and Japan. As a result, the world has become safer and more prosperous than it has ever been. The organization has even participated in these efforts, Which has stretched out their plans across millennia instead of a few decades, seemingly contradicting their goals.
What would make it necessary to allow the magical ward to heal before the next seal can be broken?