I think it’s hopeless. They’re talking to people who are looking for an excuse to believe.
It’s also worth noting that the “company with strong ties to the Clinton campaign and an economic incentive to blame foreign governments for cyber attacks on evidence that was either flimsy or non-existent” included several important caveats in their own report.
Also, even if they were right, it certainly doesn’t prove Mr. Putin was in charge when it happened. In fact, it mitigates against it.