RE: "What matters is that this was just a temporary condition for this election..."
No, it's not temporary. It continues. For instance, most news outlets in the US have reported that Russian trolls have been actively stoking the partisan "outrage" over the NFL "take-a-knee" protests.
Also, it's not just the USA. During the French election, Russia targeted Macron's personal life. "The spying campaign included Russian agents posing as friends of friends of Macron associates [on Facebook] and trying to glean personal information from them, according to the U.S. congressman and two others briefed on the matter."
I think the Russians have stolen quite a march on the West in the use of social networks for political disinformation, propaganda, and societal disruption. That's the problem.
Yes, the West has interfered in many other countries. But that's not the point. The West uses tanks, and so do the Russians. But the West does not welcome Russian tanks into our countries. And of course we work on ways to defeat their weapons.
I don't much care whether the Russian efforts actually tilted the US election enough to get Trump into office. Political dysfunction and decades of shit-headed, destructive partisan politics were enough to do the job.
In my opinion, it's much more important for the US and the West to recognize the way the internet and social networks are being weaponized by the Russians' use of fake accounts, trolls, and propaganda-amplification techniques. Again, in an analogy, it's as if Russian tanks are more effective than ours, and they have developed stealth technology so that they can attack us on our home turf -- and we just now noticed it.
Again IMHO, the West is more vulnerable than Russia (or China) to these techniques: we have a tradition of free expression, open elections, and vigorous political scrimmage, while Russia controls political expression and elections are mostly a sham. So Russia can use the internet to disrupt the politics of the West more effectively than the West can disrupt the politics of Russia.
Why would the West not be concerned about what the Russians are doing? Why would we not take it seriously, and try to find ways to expose and denature the trolls, disinformation, and propaganda amplification?