"He who controls the past controls the present." George Orwell, 1984.
GedankenPundit points out “the emergence of a new device on the modern battlefield: the repeal of history used as a weapon of war”.

“Most people believe Israel started the many wars it has fought with its neighbors”, he explains, “Few know that Israelis have been victims of terror attacks since long before 1967, or that Israel accepted the original 1948 UN Partition Plan while the Arab nations rejected it, or that the Palestinian refugees were displaced by wars started by Arabs, not expelled from their homes by Israel. Perhaps these myths are perpetuated by the ready access to information that the modern age has brought us; it has become so easy to obtain information that most people don't bother checking for corroborating reports from multiple sources. On the other hand, many people who should know better, such as university professors, also have fallen for the revisionist view of history”.