It is a God given personality trait, luvbeaches. Just as you were born with a personality that causes you to not take risks, these men were born with risk taking personalities. Your personality is important to the world, as is theirs. We wouldn't have developed very far as a culture without risk taking men and women----heck, there wouldn't even be 13 states, much less 50 without risk takers!
I have both personality types among my children, and believe me, it is breath taking to watch those risk takers develop into young men! The things they've tried have contributed to the development of a grey hair or two on my head!
The most precious gift we have for the families of these men is our prayers for their comfort, and it is so wonderful that even though you don't understand the risk taking behavior that cost them their lives, you are praying for their families. I know if the families were reading here, they would thank you for that.