You can stuff some ballot boxes and turn a polling station. But to do the same across the country to rig the election? At this point your country probably has worse problems and they won't even bother counting votes, but announce wholly fabricated numbers.
With electronic voting, it becomes trivially easy for a single hacker to falsify the entire election in one fell swoop.
Usually you can't to manipulate elections "on a massive" scale to win, regardless of the format of the ballot. If the polls are 50/30 and the 30 ends up winning the elections, it will always be too obvious. Elections are usually stolen on the margins, look at most apparently-rigged-but-not-obviously elections in history.
>At this point your country probably has worse problems and they won't even bother counting ballots, but announce wholly fabricated numbers.
And yes, usually, when an election rigging scandal comes up, the country has more serious problems than vote manipulation.
>With electronic voting, it becomes trivially easy for a single hacker to falsify the entire election in one fell swoop.
But yes, I wouldn't say "trivially easy", but yeah, a lone wolf would never be able to falsify paper vote elections.
There is nothing simpler than voting with a pen. Everybody understands how it works and everybody is able to do it anonymously. There is no risk of exposure and massive scale manipulations. Every computer system that aims to guarantee the same, is massively complicated.
This way, only you know the public key, and you can check that your vote did indeed end up with the candidate you voted for. You may disclose your public key if you wish to do so.