Heavens! How people do miss the point.
It is not about obliging people to feel guilty. It is about understanding the discrepancy in life experience and outcomes between, let us say, white and not white citizens of the U.K.
It is very clear that those posters very much on the defensive here have never once had to consider what it might be like to spend decade upon decade being perceived as 'less than' in the country of your birth.
Even people with numerous prestigious institutions on their CV live with this every day. Compare and contrast, for instance the discussions on Exeter university in the Black Mumsnetters section and the one elsewhere on MN. That is the legacy that needs to be repaired. Those fortunate children of educated, ambitious parents - still less able to make a free choice of university. Because the sons and daughters of MN posters believe they have a right to assault and attack them. And because the wives and husbands of MN posters, the adults leading such institutions, still cannot grasp their responsibilities properly or share leadership with their non-white peers. And because when their parents attempt to discuss these issues here, other posters attempt to drive them off the board because they're not "chatting happily".
I simply do not understand how anyone can, maliciously or otherwise, insist that the effects of history are now all in the past.