UPDATE: Subpoenas to be narrowed.
Fox's reporting is misleading. It said the Houston pastors subpoenaed were not part of the lawsuit against the city. It turns out they ARE associated with the those party to the suit. This makes a subpoena in the discovery phase of a hearing more understandable. The courts want to see relevant material to the case. It still appears to be over-reach, to require those associated pastors not even party to the suit to divulge all they've been saying about this situation. But if you're going to support suing a city council over matter x, it doesn't make sense to then be outraged that the city court will ask to see what you've said about x. Your obligation to the court depends on how you have supported the suit.
Apologies to my readers for sensationalizing a situation too quickly. Context is crucial!
See here for more.
Also, the outrage doesn't fit what may be an opportunity, in a Philippians 1:12-18 kind of way. Are we more worried about our freedom, or about advancing the message of Christ? What if Paul refused to respond to Agrippa's subpoena in Acts 24-26?