I think you are completely wrong. Even during the “no first use” protest days of Reagan, NATO still had deep bipartisan support.
In the halls of congress I’d agree. But among the American people… you’d have to show me. I was very much alive and kicking back then and I don’t recall anyone ever singing the praises of NATO. I recall many wondering why their sons were sent to Germany to play chicken with the Russians when only the British seemed to stand with us.