You fail to make one small difference. The targets of George Washington were military targets, not civilians. The British that were bombed in Palestine were again, military targets. You cannot even get close to saying that Arafats' targets were military.
There is a distinct difference between revolutionaries and terrorists, a distinction you obviously do not quite get.
The Irgun and LEHI, along with targeting British military targets, also terrorized and targeted civilians. The Irgun would plant time bombs in milk cans, and place them in Arab markets in Palestine, among other tactics. Also, they would murder civilian informants to the British. In September, 1948 LEHI assassinated the UN's first ever peace mediator, Count Folke Bernadotte af Wisborg of Sweden, who had been assigned to mediate between the Arab League and the nascent state of Israel. Yitzhak Shamir, one of the three LEHI leaders to order the assassination, later went on to be an elected Prime Minister of the State of Israel. In July, 1946 the Irgun bombed the King David Hotel in Jerusalem which was the base for the British Secretariat, a civilian administrative dept. of the British government in Palestine, the military command, and a branch of the Criminal Investigation Division, a police unit. The leader of the Irgun at that time, Menachem Begin, orchestrated the bombing. He also went on to be elected to the Israeli Prime Ministry. To fund itself, LEHI would routinely rob banks in various cities in Palestine.