1.) people have the ability to do anything and everything, therefore they have a right to do anything and everything.
2.) without government, which is called the "State of Nature," people have rights to do anything and everything. As a result, life for everyone would be "nasty, brutish and short."
3.) government is instituted by the people to maintain and magnify their original rights and to apply justice when one violates another's original rights.
The United States' Government is Lockean in principle.
(see The Declaration of Independence)
1.) people have an inherent right to justice
2.) in the "original state," people had equal knowledge, and experience and would agree on the same things (because they reasoned the same with equal knowledge).
3.) everyone on this planet had to agree on the same rules to "play the game." And here we are. (He said more, but I don't have the resources, time, or patience to explain more at this time.)
If you shall say "there is no truth," you also say, "there is no moral law." As Lehi expressed, "If ye shall say there is no law, ye shall also say there is no sin. If ye shall say there is no sin, ye shall also say there is no righteousness. And if there be no righteousness nor happiness there be no punishment nor misery. And if these things are not there is no God. And if there is no God we are not, neither the earth; for there could have been no creation of things, neither to act nor to be acted upon; wherefore, all things must have vanished away." (2 Nephi 2: 13) Yet, Here remains all things; to act upon, and to act. There has been a creation of the earth and the heavens, and all things that in them are. Therefore, there is a God. Misery and punishment are unavoidable in life, and that means so is happiness and righteousness. If you have seen happiness and righteousness, you must say there is that which takes it away, even sin. And if sin exists, there is moral law. If there is moral law, then there is truth; and where there is truth, there lies justice also.
"Justice and judgment are the habitation of thy throne: mercy and truth shall go before thy face."(Psalms 89: 14)
See also Free Forever, to Act for Themselves By Elder D. Todd Christofferson