In fact, I advised a client not to respond to one last month. It happens every day. Merely because someone issues a subpoena does not mean one has to automatically reply. One is entitled to object to the subpoena and to litigate those objections with the relevant authority.
So, even if you believe someone's reasons for non-compliance are really, really stupid, they still get their day in court to argue them just like anyone else.
Can you provide a link to your previous post asking for Eric Holder to be disbarred?
https://www.politico.com/blogs/under-the-radar/2014/10/judge-declines-to-hold-holder-in-contempt-196650
Judge declines to hold Holder in contempt
A federal judge has declined a House committee's bid to have Attorney General Eric Holder held in contempt of court and perhaps even jailed for failing to turn over documents related to the Justice Department' s response to Operation Fast and Furious.
So, wait, you are saying that Attorney General Holder was also "behaving like a fascist" or do you believe that the law concerning failing to comply with subpoenas depends on who is making the claim?
If you are, then I'll be fascinated by your reasons.
Can you explain why it was okay for Eric Holder not to comply with a Congressional subpoena, and instead to fight it in court, but it is not okay for anyone else?
I can guarantee you that the California bar would reach the result that whether compliance with the subpoena is required, is NOT a matter for the California bar disciplinary committee to decide. And they would be correct.