That's the joy of a two-party system. They're never going to compromise because it means compromising with the only competition. The fact that each party is also polarizing further and further from each other means compromise is getting less likely than never, too.
Prove that the liberals are getting more extreme.
Not... extreme... Polarized.
But... if you want proof... what about the riots and strikes because Trump won the election?
1: Riots and strikes are very, very different things.
2: By all means, provide evidence of an actual riot caused by liberals in response to Trump's election.
The right has been drifting further right for decades, while the Democrats have remained at the same place of moderate neo-liberalism for that same time. This is the whole reason I'm disillusioned with them, in fact. We need an actual liberal party, not a fiscally conservative middle ground party. Democrats are afraid of single-payer healthcare for god's sake!
The failure of the Democrats to be anything but the party of compromise is the whole reason they lost the election. They ran Hillary when any other animate object could have defeated Trump. So you see why I'm annoyed when people say the Democrats are too "polarized." There is one party driving this split, and they are also writing the narrative that both sides are just as bad.
Only one side denies climate science. Only one side electroshocks gay teenagers. Only one side opposes universal health care. We cannot lose sight of this. The Democrats are in need of reform -- deep reform -- but the Republican party is fundamentally perverse.