Today I came across this question. It is asking for someone to identify a piece from a picture of the sheet music. This is obviously off-topic so I flagged it and it also got closed about a minute after that.
However, I knew which piece it was so I just left a comment under the question which basically answered the OP's question. Another user confirmed that I was right and posted a link to the piece on IMSLP (He tagged me in his comment, so I got a notification).
A couple of minutes ago - while browsing another SE site - I realized that the notification was gone, so I came back to the question to see if the question was maybe deleted altogether. The question is still there but both mine and the other user's comments were deleted (I'm guessing by a moderator).
So my question is: Was I wrong about commenting and answering the OP's question just because it's off-topic? Is it because providing an answer makes it seem like it's okay to continue asking these types of questions here?