The reason being that unfalsifiability was the key point behind Henderson's letter. He wrote it with the intention of addressing that point. Why do you think it odd that it is then the focus of comparison when the FSM is raised in a thread? Because unfalsifiability was the reason the FSM was raised by Henderson. It was the specific intent. Everything else is more to do with the accompanying religions, and the attributes they ascribe to the deity. Would you prefer we focus on something for which the concept was not intended? Perhaps you're more wondering why the discussion hasn't moved on to comparisons of the religions? What do you mean by "dismiss"? Dismiss from what? From things to believe as true? Sure, for me. To dismiss as false? No. And how would such be "semi-rational"?