All land claims are invalid if someone owns an excess

To use force against another person in a justified way, requires that it must improve general wellbeing. It might be beneficial to lock up a criminal. Protecting land claims is not defensive as we cannot claim to truly own the land. When we use force to defend the land, we are using it to defend property rights and land claims themselves, not the particular plot. We are defending a system of property claims, which might be illegitimate if they (any one of them) have violated the Lockean proviso.

The system of property rights, in its entirety, is illegitimate if some of the constituents, beneficiaries are in ownership of an excess. If some people own an excess, the system of property rights is invalid.