I don't think this is true in most political contexts. Political activity is often positive-sum or negative-sum.

People do make compromises that improve total utility. Special interests demanding special handling aren't always wrong -- sometimes they do have special concerns that can be met cheaply, and that ought to be.

Conversely, political process can be negative sum. It sometimes results in inefficiencies -- either rent-seeking or awkward half-measures that produce less utility than if one faction had total control.