Mr D
What would " evidence " look like for you?
It depends on the specific allegation, but generally I would need to hear sworn testimony in court (can be cross examined and rebutted). If we're talking about hacking of voting software, I'd need to hear from eye witnesses (preferably) and/or computer forensic experts who examined the relevant machines and testified that they'd been hacked. Then I'd want to hear evidence of who the actual bad apples were.