My guess (as an EX mod), is a combination of (a) and (f).

(a) because: If the post is moved with a redirect in the original forum, then that does bring the AMA forum to the attention fo more people.

(f) because: Marc has always said from day one that since politics tends to generate a fair bit more passion from many of us than other topics do, that the AMA forum would allow for that and permit a bit more "heat" in the posts than the regular forums do. If that's still the policy now, then moving the dicussions from the other forums into this one gets rid fo the problem whereby something that is allowed to be said about this topic in this forum gets nuked when said in one of the regular forums (thereby creating lots of animosity).

These are just my guesses in this case, not an explanation of what actually happened.

Gordon