>> ...with paper voting, you as a single actor can only influence one voting booth, while as a hacker, you can manipulated thousands of voting machines.
That depends where the person is. The people managing the process, those doing the counting, have plenty of opportunity for large manipulations. There are safeguards, but the possibility remains and must be accounted for.
As I know it, you have 2-3 persons that count together one urn. That's not one person doing it. And you can do recounts. And adding large numbers of ballot papers is not easy because its marked how many there are in a ballot.
(What is more effective is declaring a number of ballots invalid if they are not the right candidate but still, we are speaking about in extrem cases 100 votes, not possibly millions as would be possible in hacking an electronic voting machine)
