Right to take a land? What is it? Did the Brits have a right to take over North America? Did the Spanish have a right to take over South America? Who gave the English people their right to occupy Australia and New Zealand? Who gave the Anglo-Saxons their right to occupy Britain, and the Francs to take over Gaul?
The area of Israel was occupied time and again by different people and different empires. Who gave the Assyrian and Babylonian empires their right to occupy it? And what about the Persians, the Hellenists, the Romans, the Byzantines, the Arabs, the Crusaders, the Mamluks, the Ottomans? Who gave them their right to occupy the land?
Let us all forget for a moment that the Jewish settlement in Israel was confirmed formally by the UN as a state, and that it was backed up by the British Mandate of Palestine (who was, for itself, a formal and authorized mandatory, backed up by the League of Nations), you cannot ignore the simple fact is that no one "invaded" to someone else's home, because it never was "his home".
The Arabs of Israel (Palestinians, that, by the way, invaded the land just like every other nation before and after them), just like the Jews of Israel, just like the Christians of Israel, lived since ever under someone else's rule. They never had a sovereign country; their sovereignty was never breached, because they never had one!
As for the killing, I'm sorry to break this one, but the Arabs are not less guilty then the Jews, maybe even more. Just open a history book and read for yourself: 1920 riots, Jaffa riots of 1921, 1929 riots, Arab revolt of 1936-1939…
Practically all of the wars that Israel had since 1948 (including) were started by its "peaceful" neighbors.
Why do we call the Palestinians terrorists? That is your interpretation. I don't like generalizations and I don't call innocent people "terrorists".
And still, the truth is that the tactics of Hezbollah, Hamas, Fatach, the Islamic Jihad and the rest of the Palestinian "freedom fighters" target Israeli civilians. They, as opposed to the Israeli army, aim their attacks at innocent men, women and children.
How would you call a man who bombs himself in a club, killing 21 teenagers (in the range of 14-19 years of age) and injuring 120 more? "Freedom fighter"? I wouldn't say