There is a difference between regretting events of 830 years ago, compared to 80 years.
How so? in both cases the people who committed the atrocities are (with very few recent exceptions) dead.
I didn't see any 'regret' expressed in that post: no difference in attempted 'points scoring', for those who celebrate events in 1415 or 1690 with such relish.
Those who live in glass houses, etc.