We Never Know
No Slack
Some of those would be factors.
For example, an alcoholic wouldn't qualify for a kidney transplant.
I say this is fair, given that kidneys are in short supply.
Why waste one on a drunk unlikely to have a successful outcome,
only to let another (better) recipient die, eh.
What about "since you have been vaccinated you should be ok". We need to help the unvaccinated.