I don't really see how "post slandering MIRI is downvoted into oblivion and receives not a single positive comment" is strong evidence of a problematic metacontrarian trend. (And needless to say, I agree that Alicorn's action is correct.)
That's a fair point. I should wait for that to materialize before expressing my pessimism about it.
ETA: And here it is: http://lesswrong.com/lw/l8j/important_information_about_miri/blld?context=1