You must be doing something else wrong then. Because in fact vaccinations are good, and not very painful especially with anesthetic.
I don't say this to insult you. I say it because problems have solutions. That is what you seem to be trying to deny. You want to say this thing went wrong, and therefore children must be hurt, it's inevitable, and trying to prevent it is crazy. I take the view that when people are hurt, someone has made a mistake, and we can try to do better.