I don't think it's a Christian thing because a significant majority of the white people who are super vocal and vehement about how not-racist and not-like-other-white-people they are, are not religious and many openly identify as atheists. I think the western world (historically mostly white) has had the notion of "with great power comes great responsibility" deeply embedded into their subconscious minds. There is no denying that historically the western world has collectively achieved and maintained tremendous power versus all other civilizations on the planet, even though nearly every other civilization certainly tried to achieve dominance themselves. So there is a massive internal, mostly unconscious conflict of "we collectively achieved so much more power than anyone else but we don't want to acknowledge it because that would be arrogant but also we need to be responsible and ethical with our power".