1. Tearing down people’s houses is usually a bad idea. The Israelis picked it up from the Brits. Note that at the time Britain was an empire, and today it is not. The tearing down of houses is one of the sorts of things that undermined the empire.
2. If you hold by zionism (which hareidim do not), then one must consider the laws of the medinah to be valid since to hold otherwise is to deny the legitimacy of the zionist state. By rejecting the laws of the medinah, the protestors are in effect saying that zionist is illegitimate.
3. There is plenty of land in Eretz Yisrael which is recognized by the Zionist government and the western powers as open to Israeli settlement. There is no need to take land that most of the world considers to be owned by Palestinians.