You guys who are criticizing the fictional "humans" for being like the real life counterparts do realize that almost every intelligent (at least on the level of humans) species in fiction (including every single one in this very manga) is also based on real life humans, right?
Considering there is no other species with the same/above level of intelligence around to serve as a basis for comparison, and that human knowledge is never one that creates, since it just copies what nature has to offer (after a phase of understanding, or not), it's to be expected.
Stop judging a whole *insert group here* for their lowest (in whatever criteria) *element(s)*...