You can still hack open source though. Some of the highest profile security projects like openssl get hacked. Sometimes it just takes a simple misconfiguratio

You can still hack open source though. Some of the highest profile security projects like openssl get hacked. Sometimes it just takes a simple misconfiguration to get hacked, like with Debian a few years ago. The point is, computers provide a single point of failure. Bribing enough of a country's electoral officials to shift a vote without being detected is immensely more difficult in comparison to finding a zero-day in some voting software. The only guarantee that open source provides, is that we'll probably find the bug eventually. A malicious state actor that wants to influence an election has absolutely no incentive to let people know that they've found a vulnerability with any sense of alacrity.