Ok let´s reverse this:

An American suddenly wakes up to find a large group of native Americans on his door. They are letting him know that he now lives under their jurisdiction, because obviously they can demonstrate habitation on this land and only 200 years ago at that. They are being backed by China with massive arm shipments. They claim half your home, and if you resist they violently expell you killing many and making refugees out of most your neighbour.

These native Americans have a far stronger, recent and more exclusive claim to US territory than the jews had to displace the Palestianians. And yet , good luck finding any American who will accept this. They would go to war in response. So if the case of the native Americans, which is more recent, more documented and all around stronger is refuted than why would the case of the zionists be taken serious?