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FYI the United States has always maintained a first-strike policy as official nuclear doctrine. There is no language restricting nuclear weapons to just nuclear retaliation.
https://www.defense.gov/Portals/1/Spotlight/2022/NDS/NUCLEAR STRATEGY AND POLICY - NPR Factsheet.pdf
Well, the equations that predict black holes also predict white holes, and the big bang is functionally equivalent to a white hole. And we have found black holes. So…seems like the most plausible explanation for the big bang is…it was a white hole. Still can’t extrapolate backwards for the same reasons, but there are at least implicit causes of white holes suggesting there was spacetime before the big bang.