Well thats the real question. Many of the kinds of things you mention are ordinances which; while they are lawfull entities they mainly deal with localised issues that could not really be extended to the rest of the country. States need rights and priviledges to be able to respond to particular issues that affect them individually.
The Supreme Court is a body of lawgivers that decides how we as a people should conduct our business according to the set of rules laid down by the Founding Fathers who themselves took their point of veiw from the French Model of Democracy Liberty Equality. That would be the way we know what is rightfully our duties, responsibilities and protections from abuse of power.
People seem to forget that the Fathers were deathly afraid of the mis-use of power and it's effects. Thats why there is no written expression by any of them that declares there is even the concept of legislating from the bench.
They saw the House and Senate as administrative bodies that conduct the daily business of life in America.
The Court is the symbol of their allegience to the concepts that they fought to create in our government; that of protection from the majority for the minority; freedom of expression; fairness of treatment for everyone and the right basically to be left alone by the government as much as possible.This is my personal belief and I'm stickin' to it.
( sorry if it sounds like a lecture; it's a personality defect I have.)