They are until you need to verify them and ensure nobody owns multiple identities. The following must be true:

- We should know whether you may vote (you are a citizen, over the legal voting age, and haven't been taken away that right because of a crime, etc.) - We should know whether you did or didn't cast a vote (to prevent you from voting twice) - We should NOT know who you voted for - You should be able to know the votes are counted towards the party intended

You can't solve that with crypto, since you need a way of proving your identity, while at the same time making the payload anonymous and not traceable back to you.