What made Hitler the most evil man to ever live?

hold up Japan and Germany were the most wicked nation ever because of Nanjing (unconfirmed death toll) but America deliberately nuked 200k people, rounded them up and put them in prison camps, and then experimented on minorities with vaccines contaminated with STDs (Tuskegee Trials)? and how could i forget about the fact the USA has occupied dozens of countries And continues to use the military as a threat, not many people would deny america is an empire

invading countries
imprisoning people
killing civilians
inhumane experiments
anti christian research
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What made Hitler the most evil man to ever live?
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