Good Day Mom Kat
You ask thoughtful questions. I flatter myself by thinking that what I write may have some, paltry, limited educational value. As I say that, let me hasten to add that I think of teaching in the symbiotic sense. That is, I believe one can't teach effectively unless he is learning at the same time.
In that way one has to approach teaching with humility. I ramble on about philosophical and political questions. I learn myself from whatever feedback I get in the comments to let me know about things I hadn't thought of, perspectives, etc.
Even as I say all of that, I feel its a bit presumptious of me to say that I write hubs to "teach" (after all, who am I to purport to teach anybody anything, but out of the choices you gave, teaching is the one that came closest to what I think I'm doing with my hubs so.....
Thanks for a great, thought-provoking question. I told you the Q & A is better than the forums!