What evidence do you have that Russia hacked and then leaked emails to sway our election?
First, it's more about a constant effort by Russia to undermine western democracy than sway a single election. As powerful as the office of the President of the United States can be, Congress is more powerful and less easily altered. However, if enemy forces can seed dissent and distrust among American citizens, it exacerbates our problems.
As for evidence of Russian hacking, it's not solid but more akin to "where there's smoke, there's fire" line of thinking. Besides, didn't Trump ask them to do so? Why would he ask the Russians and not the Chinese or American hackers? Odd, isn't it?
What is also odd is that clearly Hillary's paranoia led her to use an unsecure email system which, undoubtedly, was hacked. Do anyone have proof it was hacked? Not to my knowledge, but since it was unsecure, it was certainly hackable and as SoS, she would be a prime target for all hackers, not just Russians.
What we know about Russia's role in the DNC email leak
The U.S. government has not yet publicly named the culprit behind the DNC hack. But there seems to be widespread agreement among cybersecurity experts and professionals that the attribution belongs to Russian intelligence actors. Whether Russia hacked the DNC intending to affect the election remains unknown.
"The consensus that Russia hacked the DNC is at this point very strong, albeit not unanimous," said cybersecurity consultant Matt Tait, who has been critical of Clinton’s email practices. "The consensus that Russia hacked the DNC in support of Trump is, by contrast, plausible, but something for which the jury at this stage is very much still out."