Great post.
A recrimination motivation is only addressing part of the spectrum. Sometimes, the individual might simply have had enough and sees no reason to continue with an appalling quality of life. That's personal experience, as my father had terminal emphysema, looked like an emaciated cancer patient, was housebound, couldn't care for himself, and killed himself in a very horrific way, which still gives me PTSD symptoms to this day. No note, no blaming anyone else, no transferral of responsibility, just abject, unremitting hopelessness.
What I'm left with, though, is survivor's guilt, induced blame, that is, you wonder if you could've done far, far more to create a more comfortable, palliative environment, at the very least?
In my father's case he didn't want to open up about his thoughts and be obstructed, and he only had a few months left at most, but, the level of ongoing, constant isolation and hopelessness he experienced must've been quite hellish. And, I totally agree, if anyone has that internal miasma to deal with, then reach out and talk about it. It's a cloud that needs to be dispelled not sustained, and I've seen it at its darkest.