If we were more invested in each other’s well being, especially if we had more capacity to put that care into action, wouldn’t that improve the support network surrounding those suffering from chronic mental health conditions?
Have you ever dealt with an alcoholic when he's drunk or a schizophrenic when he's acting out?
You use the word "suffering" as if they had no part in their own condition. I'm reminded of Duke, the skinhead in "Repo Man" who, as he dies, says "I blame society!":
Empathetic humanism isn't likely to do much for a schizophrenic or alcoholic.