This particular poster is going way beyond regular questioning and he repeats challenges which have been answered and repeats from thread to thread. When put on the spot with a solid comeback, he doesn't respond or acknowledge.
At that point, yes, I question the motives. Sad to see you find my comments about that to be troubling, but that's your problem.
"This particular poster is going way beyond regular questioning and he repeats challenges which have been answered and repeats from thread to thread. When put on the spot with a solid comeback, he doesn't respond or acknowledge."
Actually, that sounds exactly like the birthers I deal with. So what does it say about their motives?