A painting of Lord Balfour housed at the University of Cambridge’s Trinity College was slashed by protest group Palestine Action.
The painting of Lord Balfour was made in 1914 by Philip Alexius de László inside Trinity College. The Palestine Action group specifically targeted the Lord Balfour painting, describing his declaration as the beginning of “ethnic cleansing of Palestine by promising the land away—which the British never had the right to do.”
Poland was given a lot of territory in the west and the Soviet Union took a lot of territory from the east, without mass killings. And yes there were people in all of those regions.
In fact a lot of borders changed after WW2, and the only (or one of very few) place this devolved into a decades long murder fest is the middle east.