You can’t guarantee that the vax would have changed a thing for them because you can’t go back in time and do a redo.
That’s just wishful thinking and proves NOTHING.
Correct, only thing guaranteed in life is death. But smart people succeed by playing the odds. Dumb people are either too dumb or too obstinate to learn there are no absolutes or guarantees in any endeavor, but chance of success are enhanced by favoring path which has better odds of success.