A settlers goal is to kick out all the Palestinians from what they believe is their promised land so the Jews will have it all to them selves. When settlements are built Palestinians are evicted from their homes or sometimes have their homes demolished. In Hebron settlers who live on top of the market place throw stuff down on Palestinian shoppers and the Palestinians have to have cages put over the market place. Some have to have cages around their homes so settlers don't Abuse them. Settlers also taunt and beat Palestinians. We have to end this apartheid.
International law doesn't have a lot of clear statements about the Israel Palestine Conflict. Since the two sides are at war, law doesn't have much sway. According to international law, they should not be fighting at all. Also, no international body has prosecuted Israel for the settlement. Technically, they are perissable to the international community.
I fail to see how if I turn this question around, that you could possibly answer it rightfully. Israel is but a small section of land no bigger than one of our small New England states in the middle of Arabia. There is nothing in International Law going against what Israel is doing.
1. You can't argue that Israeli settlements in the West Bank and Gaza are legal when their very existence contradicts with the 49th article of the Geneva Convention ((IV) relative to the Protection of Civilian Persons in Time of War) which dictates that those living on settlements are committing a war crime.
2. UN Security Council Resolution 446:
"... The policy and practices of Israel in establishing settlements in the Palestinian and other Arab territories occupied since 1967 have no legal validity and constitute a serious obstruction to achieving a comprehensive, just and lasting peace in the Middle East"
No one voted against Resolution 446.