Have you seen pictures of what drone props can do to skin? Even the handheld drones draw blood easily. The $500 phantoms can cause damage requiring stitches... Not sure a baseball is the best analogy.
The drone lacerations may be a flashier image for a photograph, but baseball injuries are nothing to dismiss. Also note that all of the drone injury pictures I have seen are from the drone owner accidentally throttling up while holding the drone, which is an incredibly easily avoidable mistake.
"Hey, how about we have a game where we have one teenager fire a fast moving projectile through a space occupied by other teenagers?"
"Doesn't sound fun! Let's tell the other teenagers to get in the way of the fast moving projectile."