I understand what you are saying, but the musical notes as written in a song override pronunciation and grammar in text. If you were speaking the poem, the rising intonation would be correct. In the song, you are supposed to sing the notes.
“Supposed to” doesn’t matter to me any more. My country itself and the importance of that question is more important to me than any rendition of a song.
Musically speaking, the music is always supposed to serve the text.