"Centrism" is defined relative to the electorate.
I look at what you're saying as simply wrong, and disproven by the numbers you cited. You're essentially arguing that the preferences of a strong majority of voters should have been ignored--it's an argument that elites *should have* hijacked the process; not an argument that they did.
First, "anti-Russian sentiment" was something there was a strong bipartisan consensus about before 2016. There was a small uptick among Democrats following Russian attacks on our democracy and a large shift toward a more pro-Putin sentiment among Republicans.
It's not.
But clearly the hacking, election meddling, and contacts with the Trump campaign during that period would be investigated and covered regardless of the outcome of the election. Say there's no Comey letter and resulting 4-point boost for Trump. Clinton wins the popular vote by 6 points and the EC in a landslide. Trump and many associates are probably in prison by now, and America is collecting breathing a sigh of relief.
The Mueller report confirmed the reporting in the period leading up to it. I don't see how anyone who cares about the good of the country or the rule of law can call it a nothingburger. Likewise, ending the Trump presidency should be a high priority for all people who believe in the American experiment and of democracy and rule of law.