You obviously missed the point. How about the Avril Lavigne example again? You think it would be appropriate to add them to the "List of punk bands" because they are called "punk" by some journalists? Is that REALLY the only thing that matters? 
WHY would it not matter that several goths have raised their voices on this talk page demanding that metal bands are crossed off the list? Don't you think that goths know better what bands are goths and not? Really!