> Hillary Clinton even went as far as threatening Russia with military intervention over the emails.
AFAICT, this is itself a propaganda myth of the right (its a radical distortion of Clinton's suggestion that cyberattacks should be met with a range of political, economic, and military responses like any other attacks -- an announcement which was fairly similar in content, including the four identified adversaries, the Pentagon's own most recently announced cyberwar strategy, which predates the emails.
> And there's still zero proof Russia had anything to do with it.
There is nonzero public evidence backing the conclusion of various cybersecurity firms that particular previously identified Russian actors were involved, a conclusion which predated and whose data likely provided a key input to the intelligence community determination (which may or may not also have additional all no public evidence backing it, which you wouldn't expect to be published.)