.... Do you know what influenza even is? Are you mistaking it for the common cold? I've noticed a lot of people who disparage the flu and the flu vaccine think that it's just another word for the common cold everyone gets every year.

While unlikely to die, it can easily render them incapable of fighting or training for a week or so, and less effective for a around twice that long.

Saying "healthy people don't get sick" is either profoundly ignorant, or a self fulfilling tautology, since once you're sick your quite obviously not healthy.

In any case, there's no dimension where the flu vaccine isn't several order of magnitude less disruptive than the disease.