With electronic voting, only one category of people even has the ability to understand the system, so "the average citizen" can only ever rely on "experts". And let's be honest, even for individual programmers and computer scientists it would take a large amount of effort to investigate. Get some news going that the system is flawed and you can't tell anyone to just go and check and verify for themselves, and we all know it's not hard to find "experts" that will gladly support that claim, even if it isn't true.