This is an overly simplistic view. Very few societies that gained greater power than their neighbors were good to their neighbors; the justifications varied, but the cruelties were widespread.

That Europeans mostly managed to industrialize together, and therefore the "whiteness" was a key distinguishing feature between them and the comparatively powerless everyone-else, is simply an accident of history. Most of what you describe is simply human nature coupled with what delivers success over rivals.

And it is also an accident of history--the same accident--that has led to the Europeans being the strongest proponents of human kindness. We see the pattern repeatedly (but not universally) throughout history: those who gain power and security use it savagely against rivals, but also develop increasing tolerance internally and eventually towards others. For example, the Islamic Golden Age was exactly this same kind of modern progressive attitude after a period of superiority-enabled brutal conquest.