Agreed, I didn't buy it either. Felt a bit like a forced end-of-episode moral in a kid's show.

I see the point of the Something to Protect article as being about growing past your current conception of how you should think and act. That you need something more important to you than whatever is anchoring you to your current rules of thought, in order to do that.

Say, when Harry realized he could have used Lesath to save Hermione from the troll, instead of thinking that would have been "sort of Dark-lordish", that seemed like an example to me.

Or when Quirrel accepted Harry's lesson about strategies involving kindness, and decided to train himself in those "until my mind goes there easily". Because it was more important to him to achieve his goals than to indulge in his distaste for everything that reminded him of Christmas.

But in chapter 114 I don't see anything holding Harry back that he needs to see past. The nanotubes solution was a purely technical thing that Harry would either think of or not, and we've known since chapter 16 that Harry can think of creative ways to kill his enemies. It's as if a known chess master made a really good chess move - it may be technically impressive, but in some sense it's nothing new. If some kind of something-to-protect-like growth happened to make that possible, it's not obvious. If Voldemort woudn't have been able to think of it in Harry's shoes and with Harry's knowledge of science and partial Transfiguration, it's not obvious either.