Recently we have seen quite a few instances of users editing questions that are closed to add their answers to the body of the questions themselves.
That is a clear subversion of the rules and an abuse of the editing powers that come with reputation. Questions that have been closed have been closed —in the immense majority of cases— by votes of the users of this site, and it is doing a disservice to the site to sidestep that decision.
If someone thinks that a question should be reopened, then posting in the meta thread dedicated to precisely that purpose is a correct way of proceeding. Voting to reopen is of course also good, and going into chat to campaign is quite fine too. Flagging for moderators to reopen questions is rarely ok.