The election system is rigged to allow for voter fraud to occur, as obviously it easily happens. There is no way to track ballots cast anonymously so all those votes count. You can find out sometimes, that a person illegally voted, but their illegal vote counts as it is an anonymous ballot once in the system. It really is an honor system in a way, and people who are not honorable, and prisons are full of dishonorable people, and knowing that people generally are evil (not all the time), we must have the LAW to punish bad behaviors.
Today with so many bad actors, we need to change from using anonymous ballots to named ballots, sorry if you don't like it, but the accountability is not often there, and people get away with gaming elections and that has a huge effect on who gets into power.
Elections are decided sometimes by just a few thousands or fewer votes!
The will of legal voters is not being respected properly, and the trust that should be there in the election system is very low. The whole idea of protecting people from others knowing their vote is absurd as the people on the ballots are vetted party candidates and legally on election ballots.
AND, you cannot compare elections with anonymous ballots to a jury, The jury conditions are highly controlled, where they are together in one room eye to eye.., and they are watched over by guards. 12 jurors present and no one can cast more than one ballot as obviously everyone will immediately know someone is cheating.