What is Privacy? It's Relative to Your Intention and Motivating Factors

Biological | Privacy
Safety and Security
One point of view may be called the biological view of privacy, it concerns safety, and security, and people generally consider privacy from this personal point of view. Even animals recognize the need for biological privacy. This may be tied to reproduction, as well as physical security.
Earning A Living
A view of medical data may also fit into this category because such information may be personally detrimental to individuals. For example if it is known that a person has a disease they may find it difficult to find or keep a job based on prejudices.

Motivational and Relational | Privacy
Unwanted Sales Attempts
Another is motivation and relational, so for example when companies document privacy statements, they are communicating to customers and staff their policies which protect from unwanted sales attempts, through such things as opt-in or out ‘contact me’ selections when providing their PII. Also from the business point of view, selling collections of PII through as databases then used for sales attempts is another kind of opt-in or out of choice businesses give to customers, and require their employees to respect their customers choices.
Stealing & Identity Theft | Privacy
In this view of PII, information such as credit card numbers are the target that thieves are most interested in. Why this is most important is because it can be reasoned that far more money is made in online transactions through illegitimate means, through evil doers conning the unwary, then by legal ecommerce according to Kirk Bailey.

Wanton Destruction | Information Private or Public
The idea here is to access or destroy information for egoistic reasons, such as fun, the thrill of overcoming security and so forth. Whether or not it is PII may unimportant to these culprits but exposing PII always is to those individuals who suffer the lost of their PII.

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Although the United States constitution does not call out a “Right to Privacy” it can be inferred in the broadest sense by the people’s Declaration of Independence and their

“unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness”

Furthermore the US Constitution establishes the reasons the government will serve the people to

“establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity”

Among these “Life, Liberty and the pursuit of Happiness”, “insure domestic tranquility, provide common defense, promote the general welfare, and secure the blessings of liberty” are drawn upon to provide the basis for laws regarding privacy in the United States.