As long as he has a partner and/or other family that could take care of the children, and a good life insurance policy, I don't see much of a problem. Children

As long as he has a partner and/or other family that could take care of the children, and a good life insurance policy, I don't see much of a problem. Children are quite resilient, emotionally. And I wouldn't underestimate the positive effects it can have if your parents live interesting lives. And then, there's the bicycle helmet paradox: disparaging him for his decisions may just keep people like him from having children altogether. Considering such risk-takers tend to be well-educated, and provide an intellectually stimulating environment for their children, it may be better for society to just let him be. (the bicycle helmet analogy is that making helmets mandatory keeps enough people from riding bikes altogether, resulting in a net loss of life expectancy even when factoring in the reduction in deaths from accidents)