Why do the antediluvians want to consume their spawn?

I’m currently involved in my first World of Darkness game. While reading the clanbook for my clan (Nosferatu) I understand that there is a pervasive fear of the clan’s antediluvian founder arising and consuming current-generation vampires.

Based on my conversations with other players, their clanbooks say similar things.

However, none of us are sure what the source of this fear is. Why would antediluvian want to prey on current-generation vampires?