> And if it was actually dangerous, why did they participate?

I dunno where in the world you are but in the US there is this massive sport called football that permanently injures thousands of children who play, and the best case scenario for most players is massive, permanent brain damage. xD

So. It's not that strange for people to play dangerous sports.

This is exactly the kind of explanation I was hoping for.

Thank you.

Not so much in my experience. Granted 3/3 isn't much of a sample size, but so far have had 0 issues.