first thing to realize is that compromise usually involved splitting the difference (e.g. arbitration -- if you've ever been privy, you know exactly what i mean).
next you need to understate that starting positions matter
they know to start out WAY to the right of anything sane
democrats, being slightly more reasonable tend to open with somthing they thing will win the other side over to their POV.
... it ... will ... not ....
so this happens.
compromise has led us to where we are, ruled by neoliberal elite to haven't the foggiest idea what the average person is thinking or what they need.
oh, and #berniewouldhavewon