After being accused of being a terrorist who bombed the city of the Kremlin. IMF staff Ethan Hunt arrest warrant was issued. Including fellow others. When the President initiates "ghost protocal" Ethan falls in access or exit point. Find a way to clear his agency unclean. And defended the attack again
but that makes everything more complicated. Ethan is forced to embark on this mission with a small share of the IMF, which have to escape the guilt. And each has a private incentive Ethan could not be determined.