I think everyone should vote for themselves. If everyone agrees to do this, any person that doesn't will be a killer. This is the first action in the game, so the detective can't have guessed a killer's identity yet. If we just blindly lynch a person this round, we run the risk of killing our detective/nurse.
If you're not a killer/mafia/FG (same thing), you should agree. Unless you can think of a better thing to do, in which case, let us know.
The nurse will probably save the next person the mafia tries to kill.