I am not sure I understood your comments. But, I guess we have to define what's kiddie sport for you and for me. My kid is having 4 practices a week and a game over weekend. As you can guess, it's very completive league where you need to proof to coach and yourself every single practice you belong there. You try to compete wearing a mask in that environment and I want to see what you say after 5-10 minutes of trying. I even say it's more harm for young athlete to practice and play in that condition.
Again, I am totally fine if your kid or any other kid wear a mask. And, frankly, I am totally fine if they wear a plastic bag with a few holes over their head. It's their rights.
For your argument that not anybody died wearing a mask I'd like to ask you if anyone died of not wearing a mask playing soccer. For me, if based on the science (availability of the data and its analyses and not just what's in someone head after reading some articles from the internet) , the decision was made to allow completive sport then let kids to participate it without masks. If it's still not safe then don't open the sport and keep it on oxygen level (10-25 feet apart of the opponents).
If you really (I mean who ever is in charge) care and want to open sport safely then provide guidance for different categories (Age, Level of play (rec or competitive) , and etc. But, I guess it requires to do more work and cooperates with others. In my understanding it's to much to ask from those who are establishing all those mandates and requirements.
As for calling some folks whiners or something else I will leave it with no comments.