How and why does Locke explain the creation, value and protection of property?

Locke says that the state has a responsibility to preserve people's private property. He (1688) says "The great and chief end, therefore, of men's uniting into common-wealths, and putting themselves under government, is the preservation of their property" (p. 262). The state has to set laws which establish the rights of the people to own property. It has to have judges to decide between disputes. And it has to have people to execute the law once it's …

…Richard, John Locke, Oxford University Press, Toronto, 1963. Bowie, James, Twenty Questions: An Introduction to Philosophy, MacMillan Publishing, New York, 1964. Locke, John, An Essay Concerning Human Understanding, Oxford University Press, London, 1975. Magill, Frank, Masterpieces of World Philosophy, Harper and Row, New York, 1961. O'Connor, D.J., John Locke, Pelican Books, London, 1952. Squadrito, Kathleen, Locke's Theory of Sensitive Knowledge, University Press of America, Washington, 1978. Yolton, J.W., Locke and the Compass of Human Understanding, Cambridge University Press, Cambridge, 1970.