Inspired from the following threads:
Your challenge should you choose to accept is to make your own scenario where the bastard has the hammer of justice served on him.
Depends on the objective: revenge or "justice"?
a. If it is revenge, then one kills him out of hand and he is a blip... a footnote for historians.
b. If it is justice, then the bastard is found postwar and delivered to a suitable venue, tried and hanged or decapitated by guillotine by one of the protecting states, whose citizens were murdered in his medical experiments after a
supervised and sanctioned trial with international authority under international law (Example; something like an admiralty court.) The idea, here, is to establish formal international law protocols to make his activities universally illegal within the human community of nations and to bring additional international sanctions to bear against any nation which sanctions, harbors or condones or allows such practitioners to waste oxygen.
My preference is b. because if that can be done with Mengele as the prime legal example and exemplar, then bastards like
Shirō Ishii, and the states which allowed him to continue breathing, could be rectified in their crimes and illegal international law behavior. And yes I mean the United States in this intent. There was no reason or justification to allow what happened postwar to happen. A Mengele prosecution would also have helped with this:
Tuskegee Syphilis Study Timeline
www.cdc.gov
For 40 years, American government doctors treated hundreds of black men with syphilis as if they were human guinea pigs. But whose idea was the Tuskegee Syphilis Study? A Philadelphia author says documents point to the future surgeon general of the United States.
www.inquirer.com
By establishing in International Law that criminal sadistic experimentation upon human beings under the guise of "medical research" is a crime punishable against the conspirators who create, endorse, allow and promote such practices, maybe such outrages in the future can be lessened or avoided at least in nations that attempt to be law-abiding within the international community.