The song Every Rose has its Thorn by Poison appears to be talking about the disappointment of loss of love. During the chorus it appears to be talking about negative aspects of this:
Every rose has its thorn
Just like every night has its dawn
Just like every cowboy sings his sad, sad song
Every rose has its thorn
But the middle allusion is commonly considered a positive, night being negative and dawn signaling the end of the night.
Is this another negative, and if so why? If it’s not negative, what is the purpose of this phrase in this sequence of allusions?