Look especially for first person singular examination of motives in Nick's excellent post. It's a great mirror for one concerned with truth, goodness, and mercy - starting where one should start: with myself.
In my experience, these amateur apologists go out of their way looking for trouble, and consider their academic arguments regarding the placement of the comma in 23:43 and its relation to purgatory a sacred duty. They are Serious Catholics, and they hang out on debate boards having the same eleven arguments again and again and again. Disproportionately converts, many have serious intellectual acumen and a respect and discipline regarding the Scriptures culled from years of being Scripture-toting Evangelicals, but in their enthusiasm for their newfound faith often lose sight of the goal of the Church, which is to help form her people in the image of God.