We had other threads about the topic.

A song does not need to rhyme, but a false rhyme produces irritation, particularly when mixed with genuine ones. Best avoid it, unless you're Bob Dylan.

"Man" and "san'" do rhyme, if so pronounced, but "cry" and "died" never. He may have resorted to something like "... That too many folks had to die" – but then, I didn't win a Nobel Prize yet.