Try acting rationally. As it happens I am older (66), disabled, diabetic, and am in 3rd stage Congestive Heart Failure and A-Fib. In the circumstances being considered I would be less likely to be treated than any of your folks. I definitely want to go on living, but if I found that a Doctor had to let a healthy young person die and treated me because of some policy of fairness, I would feel ashamed.
You tell him that he's "life not fit for life" because G-d saw fit to "tweak" his immune system.
If people *choose* to give their lives to save another, that's fine. But it's IMMORAL to allow someone to die just because they're weak or disabled.
Sorry that I can't be "rational" about my only son being put on a eugenics culling list.
(My daughter might make it. Her problem is correctable with surgery. How *grateful* I should be that "they" might give her a chance to continue breathing. /s)
And YES, I believed that life is precious and worth fighting for *before* my son was diagnosed. "Compassionate" Conservatives, my ass!
Most decent people would “self choose” treatment or not.
If my grandchildren or children or sons in law were seriously ill as I was I and there was a shortage of available treatment, I would without reservation say “treat them first” out of love. I think all of us would do such.
Prayers for you!