I've heard that the helmets actually make it worse, because it "weaponises" the head. You're much less inclined to smash into a guy with your head at full force if it's got no protection on it, but in American football you feel like you can use your head to hit people, because the padding makes you feel invincible.
If you keep banning the "most dangerous" guess what? You still end up with nothing left.
Reading this reply made by IQ drop. I don't think I can watch rick and morty anymore.
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I have some bad news for you once the FOTM football research is done and they start looking at soccer...