Originally i was going to post a huge long winded answer to this, but, well, i didnt.
But, just to use your initial example, Hitler did kill off millions of people, but was indirectly responsible for the nuclear age (the single greatest human technological achievement to date), for rocket technology, and many other technological innovations. The ramifications of world war II can be seen in so many millions of things today, that I can honestly say that the Axis (Hitler + Japan, mainly) drastically reshaped the world, for better and worse.
If i was the doctor there, and if i knew every single thing that hitler would ever do, and i had the opportunity to kill him, i would still try to save him with every resource available to me.
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