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The world is governed by the United States of Earth, established after a devastating war in the 1970s between the Western Powers and the Eastern Bloc (the Soviet Union and its satellite states as well as Communist China and its satellites). The West won the conflict with the aid of Lunetta, an orbiting space station that dropped nuclear missiles on the Soviet Union.
https://en.m.wikipedia.org/wiki/Project_Mars:_A_Technical_Tale#Synopsis
Not to give ideas, just citing the likely source of those ideas and what the people involved may think would be a “good idea”.
Opting for hypersonic missiles (that could carry warheads) instead of simply interceptors, would fit right into that scenario.