I suppose the lesson is that I should always remain open to the possibility that my reactions are being driven by some obscure process, and remain committed to responding thoughtfully rather than reacting "righteously." Like so many lofty goals, this will be impossible to perfect.
Another wise one said "you can't push and you can't pull, you can only walk beside." No control, just presence. Cancer as an extended, fucked up exercise in compassion and mindfulness. For a closeted type A problem solver, this is a slice of hell. I have trouble listening to the emotion and disconnecting from the content. I hate shit that can't be fixed.
All of which is to say that I can now look back a little on the past year and the past four months, and gain a slight (very slight) degree of perspective. And if that helps me be some of what K needs, I'll take it.