> And this is not despite Buddhism but because of it. In all societies where it is dominant misfortunes such as being born poor (or worse) are seen as being justified somehow, leading to astonishingly callous mistreatment of the poor and unlucky

This is very much historically true of places dominated by Christianity, and streams of Christianity still actively seek to advance this in the developed West, where it has faded somewhat largely due to secular economic developments associated with the weakening of Christianity, rather than due to Christianity itself.

Sure, there have been streams within Christianity working against it, but they've always been working against the broader society even where Christianity has unquestioned dominance.