A simple way is just to add a obvious warning - for example:
WARNING
This may work, but will likely cause your system to become insecure. Explanation. Helpful link.
This would be more helpful if this included a link and a short explanation (preferably a SE one, so it is likely to still exist later on) which explains the issue (in this case, what happens to security if the password prompt is removed). This is helpful if this is in the answer itself, as sometime people may not look at the comments.
If it says to do something stupid - install dodgy programs etc - flagging for deletion or something else may be best.
