So I will sum up what I learned.
Many Icons had untimely deaths like Marilyn Monroe, Micheal Jackson, John Lennon and many others I did not get the chance to research like James Dean. The media seems to idolize celebrities when they die before their time. For example, Marilyn died at the age of 37 in 1962,but she is more recognized then Liz Taylor who is still living. She is worth more dead than she was alive. Same goes for Michael Jackson and Elvis.
My Bono vs Don Cherry Theory, is that people don't take Bono seriously because he is a multimillionaire rock star and he should just stick to music and donate the money himself.
People like Don Cherry because he tells it like it is and isn't afraid to be out spoken. Also I think people are annoyed at Bono because he is pointing the finger at them to do something about poverty, it is like he is criticising them for not doing anything. While Don Cherry bashes hockey players or politicians, people like to watch other people get criticized.
Finally most cartoon icons have persona's that people can connect with, like Bugs as a persona with dry wit or Homer Simpson with his stereotypical average American character.
But whatever the reason we have Pop Icons, the media is the driving force that makes them.
The media coverage on a certain celebrity makes them idolized and therefore a pop icon.