I've noticed a number of questions that have been migrated from, say, Stack Overflow.SE to Security.SE -- where the migration has occurred after the question already accumulated a number of erroneous answers with many upvotes.
This is a problem, because IT Security has many fewer voting members than Stack Overflow. This makes it infeasible to clean up all the errors in the answers that got migrated along with the question: even if every IT Security member downvoted the erroneous answers, we'd still be outnumbered by the Stack Overflow votes. The theory of a SE site like IT Security is that the users of IT Security.SE are likely to be, on aggregate, knowledgeable about security, so votes from these users are likely to be a good way to capture the best knowledge about security. Unfortunately, this theory falls apart when most of the votes on a given answer are not from IT Security users, but have been carried over from some other community as part of a migration.
This problem occurs because Stack Overflow has so many more users than IT Security. It's not unusual for answers on Stack Overflow to get 25-50 upvotes, sometimes even more. In contrast, it's very rare to see even fantastic, stellar answers on this site get more than 10-15 upvotes. This means that, when questions are migrated from Stack Overflow after they already contain some answers, Stack Overflow's voting community is going to vastly outweigh the views of IT Security. Unfortunately, when questions are about security, Stack Overflow voters don't always have the security expertise that IT Security has.
I've noticed that this seems to degrade the trustworthiness of information on the IT Security site, for questions that have been migrated from high-volume sites like Stack Overflow. This is unfortunate: it would be nice if the IT Security community could take ownership and responsibility for the quality of answers on its site, but the way migration currently works interferes with that.
Don't get me wrong. We've gotten some great questions this way, and some of the answers that are migrated are quite good, too. Also, there's a possibility that migrated questions might attract new folks to come participate at IT Security. So there are lots of positive benefits to migrating these kinds of questions, and on the whole I expect it is a positive thing. But there are also some issues that seem to recur.
Does anyone have any ideas for ways to mitigate this systematic issue with questions migrated from high-volume sites over to us?
Edit (9/18): I was asked for examples. Here are a few:
Is it OK to tell your password to an admin? [closed] - Migrated from Superuser, already had incorrect answers with dozens of upvotes. See @AviD's answer for the full details on this one.
How can I avoid my password being harvested by key loggers from internet cafes? - Many problematic answers here. The highest-ranked answer recommends insecure practice (one-time passwords). The second-highest ranked is wrong and insecure. The third highest-ranked is wrong and insecure. The best answer has only 4 votes, compared to 26 votes for the top-ranked answer. Many low-quality/incorrect/confused comments (no way to downvote them).
How secure is a Windows password protected zip file? - The top two highest-ranked answers are flawed.
Is Steganography a safe method to store secret data? - The highest-ranked answer is incorrect. Many low-quality/incorrect/confused comments (no way to downvote them).
Why do people think that this is bad way to hash passwords? - The highest-two ranked answers are fine. Some of the other answers are not good. Many low-quality/incorrect/confused comments, even including some of the comments with many votes (no way to downvote them).
Now that quantum computers have been out for a while, has RSA been cracked? (Crypto.SE) - At the moment, the two highest-ranked answers are pretty confused. The best answers have only 0 or 1 votes at the moment. This was migrated only yesterday, so may be in flux (but I can't imagine Crypto.SE having enough users to downvote the poor answers or upvote the good ones past the poor ones).
Is something wrong with this algorithm in terms of security? (Crypto.SE) - This one is less problematic. Many answers are fine. However, it is cluttered with many low-quality/incorrect/confused comments (no way to downvote them).
(This list is undoubtedly non-exhaustive. I couldn't find a way to use the search tool to find all questions that have been migrated to Security.SE, and I haven't been keeping a list of these questions. But this is probably reasonably representative.)
However, there are also many examples where migration has worked out fine (which I've omitted), and I realize in the grand scheme of things a half a dozen problematic questions may not be a big deal. And, @AviD makes a reasonable point that this has been an issue even for some non-migrated questions: e.g., XKCD #936: Short complex password, or long dictionary passphrase? attracted a lot of non-standard IT Security users, and the top-ranked answer is flawed (sorry, @Jeff, but it is), and there are many other low-quality/incorrect/confused answers and comments, even some with many votes -- so as @AviD correctly argues, this is not limited to migrated questions.