No the substantial difference is the huge difference in the rules of the games. American football stops 100 times a game and sets everyone up to match up with

No the substantial difference is the huge difference in the rules of the games. American football stops 100 times a game and sets everyone up to match up with someone and hit them. Concussions dont just happen in tackles. They happen in blocking too (no blocking in rugby or aussie leages afaik). There are an order of magnitude more blocks than tackles in any play or game. Some of the football concussion studies have shown that many sub concussive hits is horrible for the brain too. [1] A football player expierences tens of thousands of these over their career. Take the armor away and you'll just have people dying instead of getting concussions. Knees to the head arent uncommon and are certainly not intentional by the kneeer or kneed. [1] https://www.npr.org/sections/health-shots/2018/01/18/578355877/repeated-head-hits-not-concussions-may-be-behind-a-type-of-chronic-brain-damage https://www.npr.org/sections/health-shots/2018/01/18/5783558...