But, as Alberto Alesina once said, in modern economics-of-politics you are *forbidden* to ask why people vote--even though it has only an infinitesimal chance of affecting their lives and spends time that could be spent doing other things.
Thus, Alberto says, if you want to get published in the APSR, you have to (a) assume people have a direct utility taste for voting, yet (b) assume also that when they do vote, they think "gosh darn it! I know that it's silly for me to be here, but now that I'm here I'll vote my narrowly-defined individualistic self interest!"
You're not allowed to wonder whether the taste for voting might also be a taste for voting for your perception of the general will...
Brad DeLong