The bloody massacre in Bangladesh quickly covered over the memory of the Russian invasion of Czechoslovakia, the assassination of Allende drowned out the groans of Bangladesh, the war in the Sinai Desert made people forget Allende, the Cambodian massacre made people forget Sinai, and so on and so forth until ultimately everyone lets everything be forgotten.
"The Book of Laughter and Forgetting". Book by Milan Kundera, 1979.