Excessive land ownership is one of the causes of poverty

Excessive (defined by the Lockean proviso) land ownership is theft.

There is only a limited quantity of land and so the rich are responsible for (the cause of) the poverty of the poor, as far as land rights are concerned. If we own only a modest amount of land then we are not responsible for causing the poverty of others. We cause poverty if we own more than a modest amount of land. Owning too much land causes poverty.