That's only true if they separate the kids into the bleachers. Most of the ones I've seen have had the kids sitting in the dug out together. If the dugout is roped off, they are sitting side by side with each other in the stands or grass. Having the kids fixed and stationary next to other kids is bound to be more risky than having them on a field running around. Plus the catcher in particular is in a high risk spot for transmission given the presence of both rotating batters and the umpire.
But I guess you don't care about the catchers. You just want to kill catchers. J/K.
You get the point. Creating distance in baseball is a solvable problem. Once you deal with the dugout, catcher, and umpire, you have almost no one close to anyone else. Make some minor rules changes if we have to, and let the kids play.