Everything is okay. Once the particular machine which is capturing 100% votes for Democrats is discovered and reported, it is taken out of service for the rest of the day.
(And if you are using paper ballots, who knows how your vote is counted.)
(And who is to stop an election worker from voting a zillion times for the Democrat? Or filling out a zillion of the paper ballots for the Dem, and feeding them into the machine?)
There are some controls, voters are counted as they sign in and the machines have vote count odometers on them. This way if a machine has 5000 votes on the counter but only 3000 voters came to the polling place at that point in the day, there is a mismatch that indicates a problem.
The Mark Ritchie recount trick. Before the election, pre-position several beater cars in some Minnesota northwoods towns with premarked ballots in the trunk. The cars are allegedly abandoned, but found during the recount.
And that is how the Frankenfraud got to the Senate.