I don't think there is any guarantee that Muslims killed in genocides is a sign of azaab and to say that sounds rather harsh and it's not a very befitting generalizationl!. Like would you apply the same measurement of judgement to the genocide of the Palestinians?!. I am in obvious agreement with the reminder that we do need to rectify ourselves / take heed from the lessons derived from those nations and peoples who have been made to be humbled (in suffering) becuase of their acts in trangressions.