You’ve fallen for propaganda that convinces you that there is an external enemy to worry about instead of actually looking at the situation critically. Right-wing organizations drive right-wing talking points.

They’ve sown distrust of traditional media and of democratic institutions

Pretty sure they did that to themselves. I didn’t need Russia feeding me propaganda to see through the bullshit, and many others reached that conclusion on their own. The Fairness Doctrine being repealed is one big reason why traditional media failed. Russia didn’t do that.

they’ve polarised discourse to that communities that mostly rubbed alongside one another reasonably well now are so idealogically opposed to each other that the middle ground has evaporated.

Right-wingers and liberals alike have polarized discourse. Leftists aren’t innocent either, especially MLs (many whom seem to be biased towards Russia), but there are plenty that I have interacted with that or witnessed that were exceedingly fair and human.

Liberals blame anybody to the left of them for not falling in line, constantly mock or berate them for demanding better, and do absolutely nothing to meaningfully do anything to improve their preferred party or improve the human condition in America. As for the right, we all know what they do.

middle ground has evaporated.

Politics and governance shouldn’t be a game of tug of war where the right have a monster truck pulling their side and Democrats pretending to hold the rope on their side.