Hero vs. Celebrity who truly remains...?

A hero in the more traditional sense is someone who is willing to fight and die for a good cause, for something just. Today hero's are either short lived or never noticed, while celebrities can be the center of all the attention as long as they do enough things that are interesting to the population i.e. the TV show 'Osbournes' and similar shows. The question remains what is truly amazing about a celebrity that they warrant such a great deal of interest? The hero of today can be anyone who does something socially responsible, something good, while a celebrity does nothing but please themselves, some do consider the benefit of others as was shown in the address made by George Clooney in front of the UN. But that action did not make him a hero or a celebrity he was a celebrity before he came there, he used his 'Celebrity Card' in the attempt of forcing the UN into action. Now what truly makes a celebrity? Is it charm is the roles they play, is it the fact that they can do what we want to do, is the true charm of the celebrity that they live in a dream like world?
Maybe in a millennia the archaeologists will write about the people in the year 2006 and how they revered a god called William Shattner, while others argue that the god Kurt Russel must be more powerful or was it Silvester Stalone that was the true master of the pantheon?
The hero on the other hand has become a very common thing every can be one, one just has to be at the right event and a week or a year later you suddenly become a international hero, for a week or two but than the hero slowly disappears again. Moving out of the light to make space for another hero or maybe for a celebrity.
Has the abundance of Hero's let to the understanding that it is easy to be hero but not a celebrity, since everyone knows what makes a hero all you have to do is find the right situation and than do the 'right' thing it is very easy right? But how do you become a celebrity someone that is interesting to millions and not forgotten quiet as fast.