True, that verse is never sung. I am not a good person to question about the intent of the the CA NAACP, but my guess at what their issue is with keeping the anthem is that the unsung verse frames the song and places it in a context which is not at all unifying. It frames it to say that, yes, the flag is still standing, but that the flag is still standing despite those treasonous slaves who fought for the British against it because the British offered them freedom in return. It goes on to celebrate and mock the deaths of those slaves who fought for their freedom. According to that third verse, it is a flag standing over and for the home of the free men, not the slave.