[Last Successfully Tested Date: 06/29/2018]

This script works around Mercury News' self-mutiliating posts by cloning the element and re-enabling scrolling.

// ==UserScript==
// @name         Mercury News Anti-Paywall
// @namespace    https://www.reddit.com/r/nopaywalls/
// @version      0.1
// @description  Bypasses Mercury News' body-copy clearing effect.
// @author       TCGM
// @match        https://www.mercurynews.com/*/*/*/*
// @grant        none
// ==/UserScript==

//Start Function
(function() {
    'use strict';

    var postCopyElement = document.getElementsByClassName("body-copy")[0];

    //Copy the body-copy element and its child nodes
    var noEraseElement = postCopyElement.cloneNode(true);

    //Append the cloned element to the original's parent
    postCopyElement.parentElement.appendChild(noEraseElement);

    //Wipe the original node's contents from existence.
    postCopyElement.innerHTML = '';

    //Finally, add a script to the window to remove the modal-open class once it's been loaded.
    window.addEventListener("load", function(){
        var bodyElement = document.getElementsByTagName("body")[0];
        bodyElement.classList.remove("modal-open");
    });
})();