In my opinion, anyone, anywhere who publically advocates making war on the United States should be considered a legitimate target.
If a few of these firebrand "prayer leaders" were to suddenly catch a bullet in the forehead immediately after starting a "Death to America" chant, I think it would have a very significant impact on others who might be tempted to voice the same sentiments.
We should take their words at face value. People who make war talk, better be prepared to make war.