I got this wrong because I thought "their" in "for their own good" referred to the stories, not the children.

Thanks, this is great! Any plans to add the "Stop/Start Passage timing" button back to RC questions? Not having it is making the timing for question 1 incorrect.

So we're supposed to assume that just because a phenomenon is described that it also happens in modern times?? That seems like a big jump.

The key mistake that's easy to make here is to confuse what the passage author is doing vs what the book author is doing. In P3, the passage author is using an example (albeit of an analogy). The question asks about the passage author, not the book author, which is why (E) is correct.

I chose ambivalent because I interpreted "reverence for tradition" as a positive thing, compared to "frustrated...by the vested interests" as a negative thing. Also, I was trying to find an answer that was limited to the authors attitude toward lawyers, to the exclusion of 18th century law in general.

Why (E) is wrong: It's too big a jump to go from rightly admired them to infer an understanding of their motives. Maybe they admire them but their main motive was to resell them for a profit.

Would it be correct to translate the question to "Which of the following, if true, would make the conclusion invalid?"

Yes!