Settlements are an invasion of a foreign country by Israel. Should France start building towns in Belgium?
They should be evacuated and bombed.
They're not a foreign country. There has never been an independent country of Palestine. Never. They are former Jordanian and Egyptian territory taken in defensive wars, and before 1948 they were holdings of various empires.
Whether they should be part of a future Palestine, yeah, most likely. That's something that will be settled in final negotiations, not by UN fiat. Until such a time, Israel should and will hold on to them as one of the few bargaining chips they have at the table.
Your last point is laughable. Who would do the bombing? What usually happens when world powers get bombed?
There is a Palestinian state, it's called Jordan
