The people's decision

In cases of the media putting out information and citizens making judgements before a trial
Or a private school fining students for having a Facebook account
Or Police(plenary) powers of the states
Or a company firing someone over something they said

We see that the constitution doesn't apply to citizen interactions
The constitution is a document that outlines the duties, responsibilities, and limitations of the federal government

Tenth Amendment
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

The declaration states that governments are instituted to secure our rights of life, liberty, and the pursuit of happiness.
From whom?
Now it seems we are only worried about our rights being secured from government.

Though, that is not a legal document
What stops other citizens from violating our rights?
Usually done as terms of an agreement or exchange. Usually terms of employment.
The argument is, if you don't like it, you don't have to enter the contract.

Then there's the 14th amendment
No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.

What about people depriving others of life, liberty, or property through coercion? The laws are ever changing