Earlier quoted context omitted.
Hi Hacker_9. In Texas, where I vote, the machines don't even print paper. We just have to trust that the machine correctly recorded our vote. The reasons for the machines are, 1. cost cutting over manual counts, 2. profiteering by well connected companies, 3. And potentially making sure only the "right" votes count, although that part isn't proven. In California we were able to vote at home with a mail-in, paper ball…
If we have to use machines why wouldn't we just source two machines from rival vendors. One machine takes the vote from the voter through whatever method, records the vote and prints a receipt that clearly states that voters choices. Machine two reads the receipt in front of the voter and keeps a second tally of votes. The two tallies are then compared at the end of the night.
Not to mention the additional level of confusion and potential for errors. All of this so you can buy two machines from two different vendors who might, in the end, still have ties via investors.