The doublethink in Arthur I. Cantor's letter {"Lebanon: It's Not Israel's Fault," Sept. 1} is remarkable. Mr. Cantor says that Israel was forced into Lebanon because the Lebanese government did not abide by its international obligation of preventing infiltration by Palestinians across the Lebanese-Israeli borders. The fact that Israel has shown nothing but contempt for international borders completely escapes Mr. Cantor. The most obvious manifestation of this contempt is Israel's oppressive occupation -- in defiance of international consensus -- of the Palestinian West Bank and Gaza Strip, Syria's Golan Heights and a so-called security zone in South Lebanon. That Israel's leadership had nothing but evil intentions toward Lebanon was well-documented in the diaries of Moshe Sharett, Israel's prime minister in the early 1950s. The diaries recount Moshe Dayan's suggestion that all Israel needed was to find a Lebanese officer who would agree to do its bidding: "We should either win his heart or buy him with money, to make him agree to declare himself the savior of the {Christian Lebanese} Maronite population. Then the Israeli army will enter Lebanon, will occupy the necessary territory and will create a Christian regime which will ally itself with Israel." Indeed, in 1982 Israel's invasion of Lebanon left 20,000 dead and hundreds of thousands homeless, under a shower of cluster and phosphorous bombs. All this to install in power the Phalangist party. In doing this, Israel contributed far more to the misery and demise of Lebanon than all the Arab petty dictators and warlords can ever hope to contribute. PHILIP G. FARAH Fairfax