No, I actually think it's more a reflection of America's fixation with celebrities. Hundreds of people die a tragic death every day (and I won't even get into the aspect of sucide being a selfish act.) People seem to pick and choose what constitutes a RIP post based on the level of celebrity. Someone posts RIP John Candy and it gets 100 response. Someone else may post a RIP random 80's one hit wonder star and it might get 5. Meanwhile, 99 other people may have just died as well but you'll never hear or give a passing thought to it.
I feel for the Dungy family, but no more then I feel for the other family who lost a son today and I never will base my feelings of a death on the level of celebrity. Anytime you do it is for purely selfish reasons and you're no better then others who have a different response.