I think that wearing headgear would be unnecessary. Of course it can be argued that kids do sustain head injuries playing football (soccer). But so what? Are we gonna wrap up kids in cotton wool so that they don't grow into men? The physical risk is part of the game. If they are going to put headgear on soccer players what are they gonna put on rugby players? Cover them in bubble wrap? Risk is part of life. The earlier a kid realises this the better.
I played soccer since I could walk, mostly against kids who were far bigger than me physically since I was such a puny specimen. The thought of being crunched actually made me a better player since I would do anything to avoid another clattering from some meathead. As a result I would emerge with the ball and my body in good nick. On occasion I did take a whack. Once a fully grown man blasted the ball square in my face. It was an accident of course. I was only about 12 years old. I fell unconscious to the floor. But after a few minutes I came to and finished the game. I call it character builiding! Another time I was about 14 or 15 playing for my local pub team. I was flying up the wing with the ball at my feet, really running flat out. Some gorilla about 40 years of age and weighing a good 16 stone bodyslammed me, he was nowhere near the ball. I actually FLEW through the air and landed on the wet turf. I then slid for a good few feet and just lay there wondering where the hell I was. I remember a ring of faces above me looking pretty concerned. But after a while I shook it off and continued. No big deal IMV.
Sometimes people do get really hurt. Like I say, risk is part of life. If you give in to wearing headgear then what's next? There are many times more injuries in the leg department. Damaged cruciate ligaments, for example. Players often develop arthritis in the legs in later life. They are just going to have to ban soccer. Then what? Running??? Think of all the injuries that a standard athlete gets. Pulled hamstrings, archilles problems, etc, etc. Again, good risk of arthritis in the kness later on.
If the argument is that heading the ball repeatedly over many years is the big risk then they will simply have to ban heading the ball. Wearing headgear won't change a thing since the force of the ball meeting with the head (even in headgear) will still jolt the head and shake the brain.
They can't make the ball lighter since it would become uncontrollable. Ever tried playing with a plastic soccer ball?