Sentient nature is one predicated on strong survival instincts. As much as we try and rise above, there are base instincts that drive us to feel that way.

[Luke pauses for a moment, considering.]

Exposure to things that are different lessens the trouble though. From what I've heard about your world, and other worlds like yours, super-humans are relatively new, aren't they? I don't know if that's really the case, but given what Steve and Clint have told me, it's been less than a century?