A better analogy might be, the NSA knows that every other country in the world has weaponized a wide variety of viruses. The NSA has also weaponized and created

A better analogy might be, the NSA knows that every other country in the world has weaponized a wide variety of viruses. The NSA has also weaponized and created vaccines for a wide variety of viruses. They know that they can't vaccinate the US population without tipping off the enemy to what they have. If they tip off the enemy to what they have, all their weaponized viruses become ineffective, and all of the sudden, the enemy is the only one with effective weaponized viruses.