The land is a major symbol of the problem, like on this map:
http://blixx.files.wordpress.com/2007/02/landloss.jpg
It's because Israel has treated Palestinians so harshly over decades, taken land, stolen land, bulldozed homes and villages, scared people off, even killed them, as we see today. Hamas has been elected to govern by a people hoping that someone can stand up to the world's 5th military power, armed for free by America.
But the hardliners in Israel are only making enemies for decades to come just as American neocons are in Iraq and Afghanistan.
Peace comes through dialogue, not through plotting the next attack.
There is an idolatry of citizenship that goes on in many of our countries. It's a cousin of nationalism and a kin of racism.
Our borders are harshly defended as we jealously guard our nothingness. It's the disparity of wealth between countries that means some countries are held aloft. In other countries the sense of nationalism defines one group over against another even to the ultimate goal of taking all their land.
Even if they were the original natives.