Human rights refers to the "basic rights and freedoms to which all humans are entitled." Examples of rights and freedoms which have come to be commonly thought of as human rights include civil and political rights, such as the right to life and liberty, freedom of expression, and equality before the law; and social, cultural and economic rights, including the right to participate in culture, the right to food, the right to work, and the right to education.
Although the preamble does not assign powers to the federal government, it does explain clearly from whence they arise. Any other influence is alien and not on equal footing, no matter the humanity of the thing.
Be cautious that you not call things rights which are not rights. We have the right to pursue our own happiness in any way we see fit. Once it infringes on the rights of another, however, it is no longer a right and becomes, at best, a privilege which must be earned.
Having food is NOT a right. It's a privilege which must be earned. Remember the parable of the ant and the grasshopper. Healthcare, education, employment, access to culture, etc. are not rights, they are privileges granted by nature upon earning them.
The lines between rights and privileges have become very blurry as of the last three or four decades. I think it's coming from the belief of many people who believe that equality means people should all be treated the same. Far from it. All people deserve the same opportunities, yes. But no man should be compelled to give of his substance to the sluggard who refuses to become that which he is capable of becoming. By the same token, charity is not the kind of thing which should be made mandatory.
There are those who believe that the men of substance should give of themselves to those who are less fortunate than they. It's easy to be generous with another person's money, eh? As a result of this belief, we are already on the slippery slope of communism wherein we preach the gospel of all people being given sustenance from the same pool of resources and yet, in practice, the elite are still the elite and the poor are slave to an even greater extent than they are already.
Again, recall that treating all people the same does not mean that all people are treated equally. Just because we have a constitution which defends the rights of our U.S. citizens does not automatically extend those rights to all comers regardless of the legal status in this country.
That's a bit convoluted and I let my mind wander overly much but you get the gist.
--Wag--