It's a lot harder to commit fraud when there's physical evidence that anyone can recount, and the counting is done in a public place observed by a variety of pe

It's a lot harder to commit fraud when there's physical evidence that anyone can recount, and the counting is done in a public place observed by a variety of people, and the ballots cannot so easily be tampered with without leaving physical evidence. With computers, even if you bring in a certified, gold-master CD containing the software under armed guard, it's still a black box. There's no way to conclusively prove that the machine counts accurately and fairly. Tampering can be done without a trace. Compromise is always a concern. Paper is always the best choice. Who cares if it takes longer to count.