I've never noticed a post or thread getting deleted that I didn't feel was perfectly within reason to delete. Like you said, the Religious debate goes on and on; the admin/moderators haven't cut into it. Also, take the Earth Theory debate. The two of us went off on a 2-3 page debate that had nothing to do with Earth Theory, now it's finally back on track, but it's not like those posts were deleted because they were tangential to the original topic. I get your point, but from my experience, what you're saying seems unnecessary.