My argument here is quite simple. The first ideal of the Knights Radiant, shared across all orders, is “Life before death, strength before weakness, journey before destination.” While the meaning and connotations of this oath are somewhat vague in some respects, Sanderson does try to explain the meaning somewhat in TWoK.
I’m writing this off the top of my head, so I don’t have exact references, but when Kaladin is discussing this ideal with Bridge Four in the chasms, we are privy to some of his thoughts regarding the words. Essentially, what we learn is that “journey before destination” means that your goal, however noble it may be, must be achieved through means you know to be right and good. So, for instance, if your intended goal, or “destination,” is preventing another desolation, then the means, or “journey,” by which you achieve this goal must be achieved without doing something you know to be wrong, such as killing innocent radiants simply because they are forming nahel bonds. (Sorry, I’m an audiobook reader so my spelling might be wrong.)
We know that Nale knows killing radiants is wrong, due to his multiple confessions of this fact throughout the series. He believes that the evil means he uses are justified by his goal of preventing the desolation. Regardless of these feelings, however, he has still broken the first ideal of the knights radiant, and yet he still retains a fifth-level bond to his highspren. In fact, all of the skybreakers retain their bonds, and I highly doubt that not a single one of them believes that killing radiants is wrong, even if they think it’s justified.
I don’t know if Brandon has an explanation for this, but if not he’s written himself into quite the corner, as he has established that, by Nale’s own perception, he has broken the first ideal — a restriction placed upon nahel bonds to prevent people from using surgebunding to do the exact things that Nale and the skybreakers are doing — and yet he and his order retain their nahel bonds.
Thoughts?