The purpose of government is to ensure the liberties of its citizenry, not play mommy and daddy protecting people from themselves.
Constitution says so, but they are (patents and copyright) rights as in the same as "freedom of speech" is a right, but are the only rights that are limited (time in this case) Interestingly, because it is a right (granted, not natural) it also requires securing. Which is, IMHO, the duty and purpose of government.
securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries;
There is no right of "contract" anywhere in the Constitution. Which is one of the reasons why I am opposed to government (at any level) defining marriage in any way shape or form (marriage being a contract). Keep in mind, I am a Libertarian, so my views are based on liberty. My views on Contracts (and incorporation) are that these are grants of the state (governments at any level) , and therefore are created and exist with the blessing of the state, which means the state can also dissolve them. Imagine a Corporation accused, tried and convicted of some crime, and the state having the power to dissolve it, sell off the assets and give the victims their due, how that would change the "moral" nature of the corporation itself. I call it the "corporate death sentence". Yes, corporations are legal entities, but only because the state allows it to be that way.
I am not anarchist. I have a very well defined purpose of government ...
... establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
Such a government would lead to a very prosperous nation and people. Anything less is a road to tyranny.