Why do you include Einstein, Bell, Tesla, and Da Vinci while not mentioning the likes of Hitler, Stalin, and Genghis Khan?

I am not so optimisitic about what life extension and other technologies that transhumanists get excited about would mean for humanity. I am reminded of Douglas Adams:

    "Meanwhile, the poor Babel fish, by effectively removing all
    barriers to communication between different races and cultures,
    has caused more and bloodier wars than anything else in the
    history of creation."