I love both of their music. Perhaps the iconic factor comes from the fact that they are self admitting failures in real life… rather than putting on a pretend front like most popstars do.
Life aint perfect, but if you can get through it with a talent and entertain people then you will become an icon.
They are no worse than previous iconic figures who have been glorified through their pitfalls, they are just on the news more and in your face more.