I would say, completely detached from my own pro-choice views, there are people in my life who I love that I would wholeheartedly try to keep alive by any means necessary. They may not be suicidal and I know this is completely hypocritical, but I'm a human and I have duality like any other human.
I do think about it though, from the other side. Recently I've considered how I would react if a loved one asked for my help in CTB. I do think, given the right illness, I probably would. An additional marker might be the fact I'd be the only one strong enough to do it. (I'm thinking of a very specific circumstance here.)
I know that's not what you're saying here, you're looking for understanding. I think, it takes a particularly strong individual to achieve that level of understanding. I think before I'd ask for it, I'd try to achieve it myself. Whether I'm successful in that endeavour is another matter entirely.