I could not care any less that anyone was hacked, I don't think hacking for information is an issue because if there's something you wanted to protect/conceal you should have had more security around it. The only thing that would worry me is if they were able to actually take a vote for Ms. Clinton and change it to Mr. Trump, or any equivalent.
As per that, one of the sources you linked explicity states that "Russian operatives did not mess with the vote tally, though they did obtain access to other parts of certain state and local electoral boards." Personally I am not an elections expert, so I do not know exactly what one could accomplish with "access to .. electoral boards," but it is my understanding that such access still not not enable votes to be modified.
It is well documented that they have been running an influence campaign, I don't think anyone denies that. That said, an influence campaign (purely my opinion, I do not know the specific relevant laws) would be fine, because the principle of our republic (not a democracy) is that the government is not susceptible to fast changes in public opinion, it takes many years to shift US policy. With that in mind, the Russians, or any foreign operatives, would have to "influence" the public for many, many, many years for a massive change in US policy to be seen.