You made the decision you felt was best for your child. More power to you and as parents that's what were supposed to do, while having the choice to do so.
Unfortunately, many adults didn't have the same choice as your child. They were forced to take the vaccine or lose their livelihood, or otherwise have restrictions on their life. The mandates are what most critics oppose, not the actual vaccines themselves.
I would just point out that it wasn't not getting a vaccine that kept your child from playing soccer, it were the misguided lockdowns based on fear and misinformation. The reality was the safest place for our children was outdoors playing their sport. In fact, being outdoors exercising was the best and safest place to be for everyone.
Best to you and your child.