Once more in English?
No vote is private. Data bases are compiled. My votes can be viewed and known by hundreds of state and federal officials. No printout of how I voted and how my votes were recorded by the machine doing the vote counting. I do not know if my votes are recorded properly because my ballot is fed into a machine and there is no verification method once ballot is fed into the machine. There is no method the voter has to verify their vote(s) were counted correctly
The short version is .... nothing goes wrong if one has the best of intentions. Sort of like hitler had the best of intentions