Australian aborigines did not have a property relationship with the land as we apply it in western society. There's was a custodial relationship. In some senses they owned the land but not to the extent that they could sell it - it was theirs to look after not to own. This doesn't mean it can't be stolen by claiming property rights, as it denies the custodial relationship, since private property exists to deny others access to that property.
As for your "a priori" or supposed deductive knowledge, your deductions are contestable. Minimum wage fixing leads to less employment? Not necessarily, this is a hypothesis. The hypothesis assumes that since lower wages lead to lower production costs, therefore more labour is affordable. But it ignores that, no matter how cheap a product, there must be income to create demand. Supply side economics is so one sided, you need to look at both sides. In a capitalist economy setting too high a minimum wage may reduce employment, but too low wages depress demand and reduce employment.
You need to read wider, Austrian fundamentalist economics is a very limited diet.
DS