https://www.gatestoneinstitute.org/14127/nuclear-missile-defense
Ronald Reagan expressed opposition to the policy of détente, and stated that Soviet leaders “reserve unto themselves the right to commit any crime, to lie, to cheat… and we operate on a different set of standards.”
“Missile defense is now seen as a key, critical part of strategic deterrence,” because it is imperative to place uncertainty in the mind of an enemy force about its ability to achieve its objectives. — U.S. Air Force Lieutenant General (ret.) Henry (“Trey”) Obering, former director of the Missile Defense Agency
Taken as a whole, missile defense today not only defends America’s homeland, but protects U.S. allies, assets and military forces abroad.
In 1983, when U.S. President Ronald Reagan launched the Strategic Defense Initiative (SDI), also known as Star Wars — a research program aimed at developing missiles to protect Americans from a Soviet nuclear attack — he was accused of engaging in “red-scare tactics.”
At the root of the criticism was the assumption that the nuclear balance between the Soviet Union and the United States could only remain stable if both sides adhered to the doctrine of Mutual Assured Destruction (MAD). That doctrine led to the ratification in 1972 of the Anti-Ballistic Missile (ABM) Treaty, which prohibited the deployment of missile defenses by both the U.S.S.R. and the U.S. beyond a minimal amount of interceptors.