The scandalous thing isn't this scale or the effects of the Russian effort, but that it occurred at all. Russia, unlike those other actors, is not permitted to get involved in US elections in this way.
It's incredibly naive to think that there aren't foreign parties involved in influencing elections and shifting public opinion; it's a tactic as old as civilization, and US intelligence agencies do it on a daily basis.
So, like the US has been meddling with local politics all around the globe since forever, including supporting political parties, "NGOs" etc in Russia?