I have yet to see this special, but did have someone tape it for me, so hopefully I can watch it today.
"Titanic was actually over-engineered for, and therefore sufficiently strong to operate safely in, her expected operating environment."
I definitely agree with this statement Parks, the Titanic surpassed several benchmarks for safety and design that were currently the standard when she was built. One mistake many people have made over the years is calling into question the adequacy of the design of the vessel by comparing its safety features to modern vessels or vessels once the new safety regulations were instituted after the sinking, while the Titanic, although obviously having far too few lifeboats, exceeded the required number at the time. Another example is calling the steel brittle, when by today's standard, it did have a lot of slag in it, but by standards of the day, it was the best quality steel allowed by the manufacturing process that existed, etc.
The same can be said regarding a number of other designs features of the ship.
Was the vessel safe? In hindsight that answer is a resounding no, but engineers and company officials ensured that she met and in some cases, surpassed the requirements of the day, and never envisioned the scenario that led to her sinking and breakup. Judging her quality by modern standards would be like judging 1912 medical treatments by today's standards. The doctors could be using the most state of the art procedures or treatments possible at the time, but to compare them to modern treatments isn't really fair, since doctors wouldn't have had that knowledge or level of technology at the time. The same is true of the Titanic's design. It did turn out to have significant flaws both in safety and design, but it wasn't because she was build with sub-par materials or design compared to other vessels of the day.