I stopped playing Rugby when before I was 18, and the final year of that was where it became serious. I have mild lasting damage to my spine which is painful rather than incapacitating and suffered one serious concussion. I also suffered some muscle strains.

The spinal damage was from playing against people in my college year group who were clearly much older than me, and should not have been playing against 16 year olds. The head injury was caused by my running towards a ruck which broke up in front of me, leaving someones head poking through to hit my face. It didn't happen in a tackle where the normal hits happen. It was a freak, but yes it would have been less likely in a tiddleywinks competition.

The other injuries I saw were a horrible broken leg from someone training in non-studded foot wear, and muscle strains typical of all athletic activities. I saw one more person knocked out in training who was simply holding a tackle pad and had their head in a very dubious position...

My point was really that the risks in American football could be reduced without ruining the game. No Rugby is not safe, neither is not taking exercise. You have to weigh up your own risks.