In plain English, one side has stolen land and resources belonging to the other and refuses to give them up. The thief is supported by powerful external agencies, while the losing side has no equivalent support. In this situation, it would be normal to call on an independent force or arbiter to compel the thief to return the stolen goods, and "compromise" would not be applicable.
But in the peace process as configured by those on the side of the thief, there is no independent agency, only an "arbiter" whose starting point is one of total commitment to the thief's welfare. How then, to solve the conflict that has arisen because of the robbery, but without penalising the robber or forcing him to return the booty? That, in essence, is where the problem lies for Kerry and his predecessors.
That's from a story at AJE today by Ghada Karmi, and it is perhaps the most succinct summary ever of this never-ending imaginary "peace process".