Where to begin?
The recent letter titled "Constitution, not compromise" is so full of contradictions that I hardly know where to start.
However, I will try.
If political parties and "deal making and compromise" are not allowed by our Constitution, why do we have a Congress?
The role of government is subject to interpretation by the office holder. Whether or not it is ruled constitutional is up to the Supreme Court. The Constitution is not chiseled in stone, and even if it were, like the Ten Commandants, it would still be subject to interpretation.
As to what the Constitution says about social programs, I will refer you to the preamble to the Constitution:
We the People of the United States, In order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defence, promote the general welfare, and secure the blessings of liberty for ourselves and our posterity, do ordain and establish this Constitution of the United States of America.
It begins with We the People and of the six foundations, four are directly or indirectly related to Social Justice. Ensure domestic tranquility and promote the general welfare are directly related. To ensure domestic tranquility we must have economic justice; to promote the general welfare is self-explanatory.
While the preamble is not in itself law, it is considered a viable part of the Constitution and has been and still is used by justices in its interpretation.