Almost literally everyone has and will continue to get COVID at this point. Not vaccinating your child, or all of the children in the US, won’t prevent that. I don’t know a single person that hasn’t had it, vaccinated or not. So, your child gets the vaccine. They’re then, what, maybe 50% less likely to get COVID for 6 months? Not exactly moving the needle as far as community transmission goes. This isn’t 2021 anymore.
If we had a better, longer lasting vaccine you might have an argument. Very, very few parents are going to do the COVID vaccine for their child every year. At the very least you’re risking them picking up something more serious just by going to a clinic or pharmacy to get it.