The problem with this analysis is that you are assuming a whole bunch of things. If you grant that Republicans had big majorities in 2008 and 2010, why do you think that was? You make the assumption that someone was forcing or tricking people into voting a certain way. It has been my experience that voters are pretty darn lazy and only vote in force as a reaction to something they don't like. Generally what they don't like is supreme power by one party or another. Obama or Clinton with a Rubberstamp congress? Nope. Bush with one party rule? Can't have that. Just like voters took away Trump's congress. The Senate got left alone because I believe the average voter wanted more balance in the courts which is where we are headed. I guess you can yell about gerrymandering, but it had little to do with the presidential race or the Republican senate.
On the flip side, each of these presidents got reelected after getting their monopoly taken from them because they were less of an existential threat to the status quo.
History didn't begin two years ago. Each party, when put into power, overreaches then gets slapped down for it. It is true now just like it ever was. The only reason you think partisanship is so one sided now, is because the media you read pushes that narrative. Partisanship has been much, much worse. There has been violence in the capitol building. Most of these politicians are playing a role for you on television. They aren't as spun up abut this as you and other people watching cable are. The only enemy they have is whoever stands between them and their next upgrade of power, which can often be someone in their own party.
There is no systematic plot from Russia or the Koch brothers, just as Obama wasn't a plant from the Muslim brotherhood here to install Sharia Law. Trump got elected because people voted for him for valid concerns and reasons and lost his congress because other valid concerns and reasons. Some of it was personality, sure, but that is the choice you make when you elect Hillary Clinton in the Primaries. He won the election. There was no foul play.
The country is as more peaceful now than it has ever been. There is less crime, less poverty, less institutional racism, less out of wedlock pregnancy, less all kinds of bad things. That doesn't sell papers though. All kinds of mountains are made into molehills on all sides of the political spectrum. And yet, there are problems that are never discussed as well because there is no grift associated with the issue. I mean, once you see the grift, all of it, I can't see how you can completely follow party line after that.
I mean, can you see the grift?