My guess is that you really just aren’t paying attention. Possibly because right-wing oligarchs keep buying traditional news rooms and turning them into weak propaganda factories.

Without control of even a single chamber of Congress the Democrats American Left has managed to:

1. Expand their state court lead in Wisconsin
2. Stop a bevy of abuse and chicainery by going to court.
3. Pickup control of Virginia, and get right to making that state better
4. Dominate in special elections to such an extent that a “blue wave” seems entirely achievable
5. Pick an actual Socialist for NYC mayor instead of a cop or sex pest, who is doing a great job by any metric
6. In Congress shut down the entire government and get the most out of any such shutdown in our nation’s history
7. Shutdown DHS to the point that the right caved to their demand to segregate ICE and non-ICE parts of the agency

Democrats and the rest of the left are fighting. But because the basic rules of American federalism and rule of law are still mostly being followed, that fighting is done by traditional peaceful channels rather than through violence.