I will return to this topic later in more detail. But, I am finally going to put down my main ideas as to why I think Palestine is a conservative cause. The reasons are fairly straightforward and I believe much more coherent than the reasons given by former Marxists and leftist "neoconservatives" in support of Zionism.
The Palestinian population in 1947 consisted overwhelmingly of traditional agrarian communities composed of practicing Muslims and Christians. They had strong family values and traditions rooted in their religious beliefs. They also had deep roots in the land and long established local communities. Their daily way of life and world outlook thus fit the definition of conservative perfectly.
The Zionist movement in contrast was led by self described atheists and socialists such as David Ben-Gurion who were intent on radically transforming the demographics, landscape and economy of Palestine along revolutionary lines. The Labour Zionists were heavily influenced by the model of the USSR under Stalin and openly cited the NKVD's violent deportation of the Volga Germans and Crimean Tatars as models for removing the native Arab population of Palestine. In this endeavour they initially received the support of the USSR and socialist bloc which recognized the ideological similarities between Labour Zionism and Soviet socialism under Stalin. This assistance included heavy arms in violation of a UN arms embargo, military training and diplomatic support in the UN. The resemblance between Stalin's uprooting of the traditional communities of the Volga Germans, Chechens, and Crimean Tatars and the Zionist expulsion of the Palestinians is thus not coincidental. They share common ideological roots and the Zionists borrowed many of the techniques of ethnic cleansing from the Soviet Union. Thus the Zionist movement was in contrast to Palestinian society the antithesis of conservative. It was radical, socialist and atheist rather than traditional and religious like Palestinian society.
It is thus not surprising given the radical socialist roots of Israel that most of its supporters have traditionally been Marxists and other self described leftists. Indeed one often sees the term "progressive except for Palestine" on the Internet. This term is used to describe leftists, usually Americans, who support Israel's ongoing repression of the Palestinians. But, Palestine has only become a "progressive cause" fairly recently. In the US most critics of Israel such as Patrick J. Buchanan have been traditional conservatives. Looking at modern Israel's origins in 1947 and 1948 this makes perfect sense.