OK. An older person getting the flu while not being vaccinated is pretty dangerous. So should I conclude that the flu shot served no purpose in her case, or that it possibly saved her from severe illness?
Well, she did get pneumonia, so no, I don't think her getting the flu every year is helpful. But it's her decision. I haven't even had a head cold in at least 7 years.
Fascinating that your mom's experience apparently applies to all of humanity. Anecdotes aren't relevant to this discussion, kid. Someone who WORKS WITH NUMBERS should know this.