That makes sense. Like, people wear bulletproof vests without having their coworkers shoot them a couple times to make sure the vest works. The best way to avoid gunshot wounds is to not get shot.
Bad analogy. What happens is that we're shooting people with .22LR (spike protein inducing mRNA) hoping it will help building immunity to bigger calibers (Covid19, not even talking about the variants).
It was bad on purpose. You can't compare the immune system to guns (like the parent does) or the Covid vaccine to seatbelts.