"Hmm. I didn't interpret a hypothetical apostasy as the fiercest critique, but rather the best critique--i.e. weight the arguments not by "badness if true" but by something like badness times plausibility."

See http://www.amirrorclear.net/academic/papers/risk.pdf. Plausibility depends on your current model/arguments/evidence. If the badness times probability of these being wrong dwarfs the former, you must account for it.