Mister, have you ever played paintball? You should see the amount of gear we wear to make sure no one gets hurt. Some idiots just wear the required face mask and that's it. But most of us have masks or full helmets, knee pads, protective clothing made specifically for playing, special gloves, boots, elbow pads, etc.
Besides... the point isn't to hurt someone anyways. If you intentionally hurt someone, you get banned from the field.