Personally, I couldn't care less if the books look like C4, blocks of cocaine, or solid effing gold on an X-ray. If they feel the need to open the luggage and inspect it, so be it.

The problem is that when the TSA opens the luggage, pulls everything out, and maybe toss some of it back in they damage items, fail to resecure the luggage, fail to re-close the locks they've removed, and occasionally "fail to return items to the luggage," or as a reasonable person would say, "steal stuff."

That's the problem. The TSA represents a larger risk to the average traveler than any potential "terrorist" threat.