The difference is that Cobain never held himself up as an arbiter of what is right or moral. Another difference is that Rush is not dead yet.
The difference is Cobain was a loser that used drugs for recreational purposes. Only freakin' jackass can't see the difference between than and someone who has a back injury become addicted to painkillers.
Is there a difference between Green Bay quarterback Brett Farve and baseball player Darryl Strawberry? Of course.