Indeed, early violent deaths do seem to strike a chord that echoes for many years. Its the combination of tragedy and that they've not lived long enough to show us that they are mortals. For example compare John Lennon and Paul McCartney. One of them a genius who's life was tragically cut short, the other is an old grandad who can't quite hit the notes anymore.
The almost necrophllic pouring over every detail of Senna's death is sad too. While I think it is tragic that Ratzenberger's death is forgotten, at least he has been allowed to rest in peace.