Why did Hitler kill citizens of his own nation during WWII? (common lit)

Those Germans he killed died either because they opposed the Nazi regime, because they were Jewish, because they were homosexual, because they held the wrong political opinions, or because they were sick or disabled, not to mention the occasional case of mistaken identity or those who were killed either someone elses’ career advancement or a sick whim.

Explanation:

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answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

what are the others?