reduce the chance of getting it (to what degree I don't think we even know), it doesn't prevent it the way other vaccines do. It helps minimize the effects of the virus. My wife was double vaxxed when she got COVID, and luckily her symptoms were very mild. I, too, was vaccinated and didn't contract it even though we all isolated together. Was that because of the vaccine that I didn't get it? Who knows?
I was around my brother-in-law all day last Thanksgiving, before the vaccines were available, when it turned out he had COVID and would start showing symptoms the following day. I didn't get it then either. It's not worth it to me to vaccinate my kids on the off chance that one of them may contract this virus that is not dangerous to them or their age group. Furthermore, everybody with whom they come into contact has been vaccinated: aunts, uncles, grandparents, teachers, etc.