Moderator: "In our televised forum, 'Moral problems of our time, as seen by dead people', we are proud and privileged to welcome two of the most important men of the twentieth century: Adolf Hitler and Mahatma Gandhi. So, gentleman, if you had a general autonomous superintelligence at your disposal, what would you want it to do?"
Hitler: "I'd want it to kill all the Jews... and humble France... and crush communism... and give a rebirth to the glory of all the beloved Germanic people... and cure our blond blue eyed (plus me) glorious Aryan nation of the corruption of lesser brown-eyed races (except for me)... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and..."
Gandhi: "I'd want it to convince the British to grant Indian independence... and overturn the cast system... and cause people of different colours to value and respect one another... and grant self-sustaining livelihoods to all the poor and oppressed of this world... and purge violence from the heart of men... and reconcile religions... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and... and..."
Moderator: "And if instead you had a superintelligent Oracle, what would you want it to do?"
Hitler and Gandhi together: "Stay inside the box and answer questions accurately".
Well, after a small publicity campaign, villains will start to ask Oracles whether there [b]is[/b] any world to rule after they take over the world. No really, XX century teaches us that MAD is something that can calm people with power reliably.
Virus that kills 100% of humanity armed with more information processing power to counter it than the virus designer has to build it is not easy to create. 75% may be easy enough at some stage; but it is not an existential risk. On the plus side we may be able to use the OAIs on the good side to fight multiply resistant bug strains in the case they become pathogenic.
One should be reluctant to generalize from a very small dataset, particularly when the stakes are this high.