Because it is history and dwelling on it does nothing to help right now.
Past injustices are like the stench of cooked cabbage. They tend to linger and spoil what you are cooking right now if you don't open the windows and let them go.
That is what is wrong with most of the world. A disinclination to let the past go.
It did not happen to you. It probably did not happen to your mother either.
Let. It. Go.
Interesting perspective. What has happened to me and to my mother seems to be the common lot of humanity. We, however, have anesthesia, antibiotics, and air conditioning, which is NOT the common lot.