Too late. They will not get by with murdering millions of people. God has perfect records of all the deeds done by every soul that ever existed. They will be judged for their deeds. The eternal sentence will be just and final. No plea deals - no alibis. Just final judgement. Every soul that was sacrificed by these monsters will be adjudicated on that final Judgement Day.
Revelations 21:
"The cowardly, the unbelieving, the abominable, the murderers, the sexually immoral, the sorcerers, the idolaters, and ALL LIARS shall have their portion in the lake which burns with fire and brimstone. This is the second death.”
There is no escaping the coming sentence to those who have committed crimes against humanity. They are already doomed. Their remaining lives here on earth will never provide them with peace or happiness.