It is not only the present age that has seen such trauma. Trauma and cataclysms have always been part of history.
Yet, typically, whatever runs to your mind are only those that have occurred in the recent past. I am sure you would not attach such emotive importance to similar incidents of the distant past. And I am also sure that even those who inherit the legacy of long past upheavals would actually care much less about those episodes than their predecessors and those who actually lived through those times did. This is human nature. We live in an age in India that has seen sharp polarisation on the basis of religion. And part of this polarisation has been caused to happen by those who remain hurt or who would like to remain hurt by past injustices. Yet, even among those that seek to keep such very old embers burning, it is only the relatively recent injustices of history that find constant favour. Thus, while mughal excesses are frequently referred to by hindu extremists, the far bloodier episodes of religious oppression by the likes of Malik Kafur (commander for Alauddin Khilji) are seldom remembered, nay even forgotten!Similarly, in Pakistan, while muslim fundamentalists keep alive memories of the pre-independence era Muslim league's fears and feelings of insecurity in a possible hindu majority united India after independence, no one remembers or is emotionally attached to the far greater violations suffered from invading mongols and turks much earlier in history !!