Excellent points. A few more things: 1. Voting machines are subject to the fairly unique design objective that, ideally, votes have to be verifiable while stil

Excellent points. A few more things: 1. Voting machines are subject to the fairly unique design objective that, ideally, votes have to be verifiable while still preventing voters from proving who they voted for in order to avoid vote-buying. An ATM can just give you a receipt showing a record of the transaction. But a voting machine can't do anything so straightforward. 2. Using an ATM is part of an ongoing course of dealings between a customer and a bank, where verification is straightforward (and largely inevitable). This allows the customer to evaluate the performance and integrity of the system over time. Voting, on the other hand, tends to be an isolated event where there is no opportunity to evaluate the voting system over the long-term.