Well you would actually think that many of the interceptors placed throughout the United States would knock out the ICBM. That leads to sneaking in a nuclear bomb into major city(ies). Nuclear Winter is a huge problem and, if enough nuclear weapons are set off, it would be improbable we won't get out of it in the people's lifetime who are surviving without plants (can't grow), possible contaminated water, contaminated livestock.
Of course OP is stupid and has no loving clue what he is talking about.