Not OK!

Have you heard the song "STAY" by Sugarland? It was written soley by the singer Jennifer Nettles. She has a really interesting, amazing voice. I like MOST of their songs. In fact, one of their songs-Just Might (Make Me Believe) -was my life anthem just a few years ago. But this song. As pretty as it sounds...The MEANING behind the words! UGH
It's about the women who is sleeping with a MARRIED man. It's from the other women's perspective. So everyone in country music is just raving about this song right now. How wonderful it sounds. How meaningful. How heartfelt.
I will never understand why songs, books, movies, that portray CHEATING in such a way that makes it seem OK or UNDERSTANDABLE! It is NEVER ok! There is NO excuse!
Am I wrong?