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And guinea worm used to destroy the lives of millions, so even if he had personally handed nukes to North Korea, the lives saved by eradicating guinea worm is a bit more than the number of people North Korea has killed with nuclear weapons.
That's probably why your comment was downvoted.
I'm not seeing how responding to "Jimmy Carter did something good" with "Jimmy Carter also did something bad" could possibly be characterized as a tu quoque, or as an appeal to hypocrisy in any more general sense.
A tu quoque would involve making some kind of claim about the person being addressed ("tu"), and there is no hypocrisy involved in doing two different things.