I know I must have heard the lyrics to Missouri Waltz, but couldn't sing any of them...unless the words Missouri Waltz are part of them. Therefore I am unaware of any offensive words, and to whom they would be offensive, in the song.

In general, however, and lacking a peculiar sensitivity, I believe that it is possible to sing songs, recite poetry or prose, and study same as originally written. We can do this while realizing that they reflect that particular historical era which may not be how we look, think behave now, and need not apologize for what came before, sanitize their words or ideas, nor expurgate them.

Sometimes these things are quaint or even offensive to today's sensitivities, but they should be viewed in historical context, and perhaps mitigated by explanitory background.

I am not one who suffers easily notions of political correctness, collective guilt, or the like. Let us correct real wrongs, not imagined ones.