I've noticed a pattern of a particular SO user that whenever he has to edit a question, that question usually gets a downvote. Now, of course I can't confirm that he's the one doing the downvoting, but, I've seen it enough times that it really seems to be the case.
It seems to me this practice is damaging to the question itself, because even if it's a decent question (just badly formed, or has tags in the title), it may get overlooked with a -1. Also, in a lot of cases one downvote attracts additional downvotes like digital chum in the water.
So, is it good etiquette to downvote in this manner?