Yet it was issued, and does it not have the force of law behind it?
Can we now ignore any subpeona because we 'think' the government had no business sticking their nose in, especially on a life or death matter raising CONSTITUTIONAL issues?
It's not a 'think', it's the separation of powers between the states and the national government. If the national government chooses to enforce this subpoena over the will of the state, on an issue that even a conservative Justice on SCOTUS points out is a state issue (not to mention the author of the Constitution itself, James Madison), you are destroying the very ideal of federalism and in effect allowing the national government to eventually become the determining factor on when life ends and death begins. They already do so in accordance with abortion (which is a travesty). Do you want them to do so in accordance with the end of life as well?
Obviously the subpeona didn't have "the full force of the law" behind it." The law is what it is, you may not like it, and if you don't, vote someone in who will change it. If you can't live under the laws of the land or change them, then perhaps it's time to move to another country. I do not believe there are any Constitutional issues involved here. It was foolish to think congress could have resolved this issue.