Politicians. Promise you the world and if you're happy you can get a bit of left-over bread.
I don't know how voting in every country is done, but certainly in certain countries to not vote means more or less giving the voting power in the hands of other idiots. And we have seen what that can do: Joerg haider, Filip Dewinter and probably Geert Wilders all have or will become a a mayor backing in voting because a lot of people decided they were not interested in voting because it is all old hat and nothing will change.